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Recent questions tagged unit16
Questions
Which of the following groups is an auxochrome?
jeemain
cbse
chemistry
class12
unit16
chemistry-in-everyday-life
medium
asked
Mar 7, 2014
by
meena.p
1
answer
Which of the following is not used in nail polish ?
jeemain
cbse
chemistry
class12
unit16
chemistry-in-everyday-life
medium
asked
Mar 7, 2014
by
meena.p
1
answer
A right angle prism $(45^{\circ} - 90^{\circ}- 45^{\circ})$ of refractive index n has a plate of refractive index $n_1\;( n_1 < n ) $ to its diagonal wall. The assembly is in air. A ray is incident at AB . Then the angle of incidence at AB for which the ray strikes the diagonal face at critical angle is :-
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
refraction-by-prism
difficult
asked
Feb 20, 2014
by
meena.p
1
answer
In YDSE intensity at a point is $\bigg (\large\frac{1}{4} \bigg) $ of maximum intensity. Angular position of this point is :
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 20, 2014
by
meena.p
1
answer
In YDSE if the source consists of two wave lengths $\lambda_1=4000 \;a^{\circ}$ and $\lambda _2 =4002\;A^{\circ}$ . Find the distance from centre where fringes disappear if $d= 1\;cm; D=1\;m$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 20, 2014
by
meena.p
1
answer
Two monochromatic coherent sources of wavelength 5000 A are placed along line normal to screen as shown. Then the condition for maxima at the point P is :
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
difficult
aims-12-physics
asked
Feb 20, 2014
by
meena.p
1
answer
A light ray enters into a medium whose refractive index varies along x-axis as $y(x) = \mu_{circ} \sqrt {1+ 0.25 x}.$ Where $\mu_0=1$.The medium is bounded by the planes $x=0,x=1\;cm$ and $y=0$ . If the ray enters at an angle $\theta=30^{\circ}$ with horizontal . Then the trajectory of light ray is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 20, 2014
by
meena.p
1
answer
In the ideal YDSE when a glass plate (RI= 1.5) of thickness t is introduced in path of one of interfering beams , the intensity at the position where central maximum occurred previously remains unchanged. The minimum thickness of glass plate is :
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A hollow double concave lens is made of very thin transparent material It can be filled with air or either of two liquids $L_1$ or $L_2$ having refracting indices $n_1$ and $n_2$ respectively $( n_2 > n_1 > 1)$ The lens will diverge a parallel beam of light if it is filled with
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
aims-12-physics
asked
Feb 19, 2014
by
meena.p
1
answer
A short linear object of length b lies along the axis of a concave mirror of focal length f at a distance u from pole of mirror , The size of image is approximate equal to :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
difficult
asked
Feb 19, 2014
by
meena.p
1
answer
In the YDSE apparatus shown the ratio of maximum to minimum intensity on screen is 9. The wavelength of light used is $\lambda$, the value of y is :
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 19, 2014
by
meena.p
1
answer
An object is placed at $ A\;(OA > f)$ Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that $\angle BCA =90^{\circ}$. Let $OA=a,OB=b$ and $OC=c$ then f is :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 19, 2014
by
meena.p
1
answer
A point object O is placed at a distance o 20cm from a convex lens of focal 10 cm as shown. At what distance x from lens should a concave mirror of focal length 60 cm can be placed so that final image coincides with object.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 19, 2014
by
meena.p
1
answer
Optic axis of a thin equiconvex lens is the x-axis. The co-ordinates of a point object and its image are $(-40\;cm,1\;cm)$ and $(50\;cm,-2\;cm)$ respectively . lens is located at
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 19, 2014
by
meena.p
1
answer
A circular beam of diameter $d=2 \;cm$ falls on a plane surface of glass . The angle of incidence is $60^{\circ}$ and refractive index of glass is $ \mu=\large\frac{3}{2}$. The diameter of the refracted beam is ,
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A convex lens forms a real image 3 times larger than the object on a screen. Object and screen are moved until the image becomes twice the size of object. If the shift of object is $6\;cm$ The shift of screen is :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 19, 2014
by
meena.p
1
answer
In YDSE $\large\frac{d}{D}$$=10^4$ (d= distance between slits ; D= distance of screen from slits). at a point P on screen resulting intensity is equal to intensity due to individual slit $I_0$ Then the distance of point P from central maximum is $(\lambda= 6000 A^{\circ})$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 19, 2014
by
meena.p
1
answer
Refraction takes place at a concave spherical boundary separating glass air medium. For image to be real the object distance $(\mu g=\large\frac{3}{2})$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 19, 2014
by
meena.p
1
answer
A 2 cm diameter coin rests flat on the bottom of a bowl in which water is 20 cm deep $(\mu_w= \large\frac{4}{3})$. If the coin is viewed directly from above what is its apparently diameter?
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A plane mirror is made of glass slab $(\mu g=1.5)\;2.5\;cm$ thick and silvered on back. A point objected is placed 5 cm in front of unsilvered face of mirror. What will be the position of final image.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 19, 2014
by
meena.p
1
answer
The refractive index of a prism is 2. This prism can have a maximum refracting angle of
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A glass sphere with radius 10 cm has concentric spherical equity of radius 5 cm. A narrow beam of parallel light is directed into sphere, as shown . Find the position of final image from centre of sphere
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 19, 2014
by
meena.p
1
answer
An observer can see through a pin hole the top end of a thin rod of height h, placed as shown. The beaker height is 3 h and its radius is h. When the beaker is filled with a liquid up to a height 2h ,he can see the lower end of the rod. Then RI of liquid is .
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
mock
aims-12-physics
asked
Feb 19, 2014
by
meena.p
1
answer
Two beam of light having intensities $I$ and $4I$ interfere to produce a fringe pattern on a screen . The phase difference between beams is $ \large\frac{\pi}{2}$ at point A and n at point B. Then the difference between resultant intensities at A and B is
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
asked
Feb 19, 2014
by
meena.p
1
answer
In a YDSE , 12 fringes are observed to be formed in a certain segment of screen when light of wavelength $600\; nm$ is used. If the wavelength of length is changed to $400\; nm$ , number of fringes observed in same segment of screen in given by
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Feb 19, 2014
by
meena.p
1
answer
A ray of light falls on a transparent glass slab with refractive index (relative to air) of $1.62$ . The angle of incident for which the reflected and refractive rays are mutually perpendicular is :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 19, 2014
by
meena.p
1
answer
When a beam of light with wave length $\lambda= 6000 A, $ travelling in air, enters a glass medium whose refractive index is 1.5 then,
jeemain
physics
class12
unit16
wave-optics
introduction-to-wave-optics
easy
asked
Feb 19, 2014
by
meena.p
1
answer
Two lenses , One concave and the other convex of same power are placed such that their principal axes coincide. If the separation b/w the lenses is x, then ,
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A $16\;cm$ long image of an object is formed by a convex lens on a screen. On moving the lens towards the screen with out changing the positions of object an image of size 9 cm is again formed again on the screen . The size of object is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
asked
Feb 18, 2014
by
meena.p
1
answer
A thin equiconvex lens of refractive index $\large\frac{3}{2}$ and radius of curvature 30 m is put in water $(RI= \large\frac{4}{3})$. Its focal length is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A lens of focal length f projects m times magnified image of an object on a screen.The distance of screen from lens is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
easy
aims-12-physics
asked
Feb 18, 2014
by
meena.p
1
answer
A ray of light passes through an equilateral prism such that the angle of incidence and the angle of emergence are equal to $\large\frac{3}{4}th$ of the angle of prism. The angle of minimum deviation is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A ray of light traveling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of $45^{\circ}$ The ray undergoes total internal reflection . If n is the refractive index of medium with respect to air, select the possible value of n from following
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Feb 18, 2014
by
meena.p
1
answer
A diminished image of an object is to be obtained on a screen 1. m away from it . This can be achieved by approximately placing.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Feb 18, 2014
by
meena.p
1
answer
A ray of light passes through four transparent media with refractive indices $\mu_1,\mu_2,\mu_3$ of all media are parallel, If the emergent ray CD is parallel ti incident ray AB. We must have
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Feb 18, 2014
by
meena.p
1
answer
Two plane mirrors A and B are aligned parallel to each other as shown. A light ray is incident at an angle of $30^{\circ}$ at a point just inside one end of A. The plane of incidence coincides with place of figure. The maximum number of time the ray undergoes reflections (including the first one ) before it emerges out is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
asked
Feb 18, 2014
by
meena.p
1
answer
In the ideal YDSE , when a glass plate $(refractive index\;1.5)$ of thickness t is introduced in path of one of interfering beams (wave - length $\lambda$) the intensity at position where central maximum occurred preciously remains unchanged . The minimum thickness of glass plate is :
jeemain
physics
class12
unit16
wave-optics
optics
youngs-double-slit-experiment
medium
asked
Feb 18, 2014
by
meena.p
1
answer
An equi - convex lens of crown and equi convex lens of flint glass make an achromatic system. The radium of curvature of convex lens is $0.54\;m$. If the focal length of combination for mean colour is 1.5 m and $RI$ for crown glass are $\mu _R= 1.53$ and $\mu_v =1.55$ Then the dispersive power of flint glass is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prism
dispersion
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
In a YDSE $\lambda =60 \;nm\; D= 2m\;\lambda=6 mm$. Find the positions of a point lying b/w third maxima and third minima where the intensity in three - fourth of maximum intensity on the screen .
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
When the screen is moved away from plane of slits in YDSE then the effect on interference fringes is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 14, 2014
by
meena.p
1
answer
In an interference arrangement similar to YDSE , Slits $S_1\;and \;S_2$ are illuminated with coherent microwave sources and are synchronized to have zero phase difference The slits are separates by distance $d= 150 \;m$. The intensity $I_0$ is measured as a function of $\theta$ where $\theta$ is defined as shown. If $I _0$ is max intensity, calculate $I_0$ for $\theta=90^{\circ}$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
A thin plano- convex lens of focal length f is split into two halves one of halves is shifted along the optical axis. The separation b/w object and image plane is 1.8 m. The magnification of image formed by one of half lenses is 2. Find the focal length of lens and separation b/w the two halves.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 14, 2014
by
meena.p
1
answer
The cross section of glass prism has the form of an isosceles triangle . One of equal face is silvered. A ray of light incident normally on other equal face and after being reflected twice, emerges through base of prism along normal. That the angle of prism is :-
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
medium
asked
Feb 14, 2014
by
meena.p
1
answer
A lens has a power of +5 diopter in air what will be its power if completely immersed in water ? $ \mu_g =\large\frac{3}{2};$$ \mu_w=\large\frac{4}{3}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Feb 14, 2014
by
meena.p
1
answer
A point source of light is placed at the bottom of a tank containing a liquid $(R.I= \mu)$ upto a depth $h$. A bright circular spot is seen on the surface of the liquid. Then the radius of this bright spot.:
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
In the figure shown for an angle of incidence i at the top surface , What is the minimum refractive index needed for total internal reflection at vertical face ?
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
total-internal-reflection
difficult
asked
Feb 14, 2014
by
meena.p
1
answer
A beam of light consisting of two wavelength $6500 A^{\circ}$ and $5200 A^{\circ}$ is used to obtain interference fringes in a young's double slit exp. Then what is the distance from central maxima where the bright fringes due to both wavelength coincides? The distance between slits is 2 mm and distance between plane of slits and screen is 120 cm
jeemain
physics
class12
unit16
wave-optics
sec-b
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
A 4 cm thick layer of water covers 6 cm thick glass slab. A coin is placed at the bottom of slab and is being observed from the air side along the normal to surface. Then the apparent position of coin surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
In a YDSE with $D= 1m,d=1mm$ light of wave length $500 \;nm$ is incident at an angle of $0.57^{\circ}$ with respect to axis of symmetry of experimental set up. If centre of symmetry of screen is 0. Then the intensity at point 0 in terms of intensity of central maxima $I_0$ is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
In a YDSE with $d= 1mm$ and $D= 1m$ slabs of $(t= 1 \mu m , \mu =3)$ and $(t=0.5\;\mu m , \mu =2) $ are introduced in front of upper and lower slit respectively . Then the shift in fringe pattern is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
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