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Recent questions in Class12
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JEEMAIN and NEET
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Physics
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Class12
Class12
Electric Charges and Fields
Electrostatic Potential and Capacitance
Current Electricity
Moving Charges and Magentism
Magnetism and Matter
Electromagnetic Induction
Alternating Current
Electromagnetic Waves
Ray Optics and Optical Instruments
Wave Optics
Dual Nature of Matter and Radiation
Atoms
Nucleii
Semiconductor Materials and Electronic Devices
Communication Systems
Experimental Skills in Physics
Light is incident at $30^{\circ}$ on one side of a right angled isosceles prism of $\mu =\large\frac{3}{2}$. What will be the angle of emergence.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-a-prism
difficult
asked
Jan 23, 2014
by
meena.p
1
answer
Light is incident normally on a diffraction grating through first order diffraction is seen at $32^{\circ}$ second order diffraction will be seen at
jeemain
physics
class12
unit16
wave-optics
diffraction
medium
asked
Jan 22, 2014
by
meena.p
1
answer
A vessel of height h is half filled with one liquid of refractive index $\mu_1 $ and upper half filled with another liquid of refractive index $\mu_2$ The apparent depth of the vessel is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 22, 2014
by
meena.p
1
answer
A beam of light strikes a pieces of glass at an angle of incidence of $60^{\circ}$ and the reflected beam is completely plane polarized . The refractive index of glass is
jeemain
physics
class12
unit16
wave-optics
polarisation
medium
asked
Jan 22, 2014
by
meena.p
1
answer
A coin lies at the bottom of a tank filled with two immissible liquid. Liquid 1 on top is $20\;cm$ layer thick of refractive index $\mu_1 =1.33$ and liquid 2 is $40\;cm$ thick with refractive index $\mu_2=1.46$. At what depth below the surface the coin appear?
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 22, 2014
by
meena.p
1
answer
A point object is placed in front of a thin lens of focal length $f= 0.50\;m$ at a distance of $1.0\;m$ . A flat mirror is placed 2 m behind the lens. What is the distance between the lens and the final image formed.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
Two thin lenses of focal lengths $f_1$ and $f_2$are in contact , the equivalent focal length is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A parallel beam of light is incident on a solid transparent sphere of refractive inbox $\mu$. If a point image is formed on the back of the sphere , the refractive index of sphere is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A Young's double slit experiment is done in air and the same set up is immersed in a liquid of refractive index $\mu$. It is found that the 10th bright fringe in liquid was in the same position as 6th dark fringe in air . The value of $\mu$ is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
The equiconvex lens of glass of $\mu =1.5$ and focal length $15\;cm$ is silvered on one side. It will behave like.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
Magnification produced by astronomical telescope for normal adjustment is 20 and length of telescope is $1.05\;m$ The magnification when image is formed at least distance of district vision $(D= 25 cm)$ is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
optical-instruments
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A microscope has objective of focal $1.5\; cm$ and eye piece of focal length $2.5 \;cm$. If length of tube $25\;cm$ What must be the magnification produced.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
optical-instruments
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A system consists of a convex lens and a concave mirror placed at a distance of x from the lens. Focal length $f_1$ of convex lens in 10 cm and focal length $f_2$ of mirror is 60 cm. If an object is placed at a distance 20 cm from the lens and it is found that the final image coincides with the object position, then what must be the distance 'x'
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
An object is kept at a distance of 12 cm from a thin lens and image formed is real. If the object is kept at a distance of $8\;cm$ from the same lens image formed is virtual. If the size of image formed is equal length of lens will be :
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
Two rays of light travel as shown.The refractive index of material is 3/2 and that of the surrounding is 4/3. What is the path difference between the two.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A system of lenses is formed by fitting a plans convex lens, whose radius of curvature is R and $\mu_1$,the refractive index of plano convex lens is $\large\frac{3}{2} $ and $\mu_2$ the refractive index of Plano concave lens is $\large\frac{4}{3}$. Then the focal length of combination is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 22, 2014
by
meena.p
1
answer
A system of lens consists of two convex lenses of focal length $f_1= 30\;cm$ and $f_2 =20\;cm$. Separated by a distance 'd'. When a parallel beam of light is incident on the first lens after two refraction the resultant rays come out parallel then the distance 'd' is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refreaction-at-spherical-surfaces-and-lenses
medium
asked
Jan 22, 2014
by
meena.p
1
answer
A convex lens of focal length 20 cm is placed glass slab of refractive index $\large\frac{3}{2}$.A parallel beam of light is incident on the convex lens. The light will converge.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Jan 22, 2014
by
meena.p
1
answer
In an young double slit experiment the slit separation is 3 times the wave length of the light used What is the maximum number of interference maxima possible
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
aims-12-physics
asked
Jan 22, 2014
by
meena.p
1
answer
Two light waves whose equation are given respectively as $y_1 = 6\sin wt; y_2 =8 \sin (wt+ 8)$ super impose to form a interference pattern. The ratio of maximum to minimum intensities of the super imposed wave is
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
asked
Jan 21, 2014
by
meena.p
1
answer
A man can view through telescope two district objects at a distance of $120 \;m$ from him if he uses light of $ \lambda= 550 A^{\circ}$ What must be minimum separation between objects if diameter of his pupil $D= 2.5 \;mm$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
optical
instruments
medium
asked
Jan 21, 2014
by
meena.p
1
answer
Parallel beam of monochromatic light of wavelength $\lambda =4800 \mathring{A}$ is incident on a single slit of size $0.2 mm$ . The angular divergence in which most of light is diffracted is [ie between two 1st order maxima on both sides]
jeemain
physics
class12
unit16
wave-optics
diffraction
medium
asked
Jan 21, 2014
by
meena.p
1
answer
In Fresnel bi prism experiment if prism angle $\alpha=1^{\circ}, \mu=1.54$ distance between prism and sources a is $0.3\;m$ and wave length $ \lambda= 180 \pi \;nm$ find the fringe width, distance between screen and prism $b= 0.7 \;m$
jeemain
physics
class12
unit16
wave-optics
diffraction
easy
asked
Jan 21, 2014
by
meena.p
1
answer
In a young's double slit experiment two films of same thickness 't' but of different refractive indices $\mu_1$ and $\mu_2$ are placed in front of slit A and B respectively. If $( \mu_1 > \mu_2)$ the central maxima will
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
An interference pattern is obtained by using red light. If in the same set up red light is replaced by blue light the fringe width will
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
A young's double slit experiment uses light of wavelength $900\; nm$ A plate of thickness 't' of material of refractive index $\mu=1.5$ i placed in front of one of the slits. What should be the thickness of plate 't' so that the central fringe becomes dark.
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Jan 21, 2014
by
meena.p
1
answer
As a result of interference of two coherent source of light , the energy is :
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
easy
asked
Jan 21, 2014
by
meena.p
1
answer
Two light sources emit light of same wavelength $\lambda$. They will form interfering patterns if
jeemain
physics
class12
unit16
wave-optics
interference-coherent-sources
easy
asked
Jan 21, 2014
by
meena.p
1
answer
If a light beam is incident at polarising angle, $(55.3^{\circ})$ on glass air interface , What is angle of refraction in glass?
jeemain
physics
class12
unit16
wave-optics
polarisation
easy
asked
Jan 21, 2014
by
meena.p
1
answer
What is dispersive power of glass if $\mu_v =1.522$ and $\mu_r =1.514$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-by-prisms
easy
aims-12-physics
asked
Jan 21, 2014
by
meena.p
1
answer
Two glass prisms of refractive index $1.5$ and $ 1.6$ are kept in contact and a ray of light is incident on this combination of prism. The light emerges out of this combination un deviation The angle of prism of refractive index $1.6 $ is $5^{\circ}$ What is angle of prism of the other prism.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-prisms
easy
asked
Jan 21, 2014
by
meena.p
1
answer
Speed of light is maximum in
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Jan 21, 2014
by
meena.p
1
answer
Focal length of eye piece of a compound microscope is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
optical-instruments
easy
asked
Jan 21, 2014
by
meena.p
1
answer
What is maximum magnification that can be obtained from a convex lens of focal length 5 cm. (the least distance vision is 25 cm)
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
optical-instruments
easy
asked
Jan 21, 2014
by
meena.p
1
answer
A man is advised to wear lens as he can see objects between 15 cm and 30 cm. If he uses lens to see far off objects what will be his near point.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-sherical-surfaces-and-lenses
easy
asked
Jan 21, 2014
by
meena.p
1
answer
In a Young's double slit experiment set up the 10th maxima is 3 cm from the central maxima . If the whole set up is immersed in a liquid of refractive index $\mu=1.5$ What will be the new fring width
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
In same Young's Double slit experiment set up two sources of light produces fringes of width $0.2 \;mm$ and $0.3 \;mm$ The ratio of wave length of two light sources is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
Monochromatic light from narrow slits produce a interference pattern of fridge width $\beta$ , for a certain slit separation. When the slit separation is doubled and distance between screen and slit distance between screen and slit is made $\large\frac{1}{3}$ rd the fringe width
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
In a Young's double slit experiment separation between two consecutive dark. fringes is $1.2 \;mm$, wave length $\lambda$ of light is $600 \;nm$ Distance between source and screen $D= 1 m $, the separation between slits is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Jan 21, 2014
by
meena.p
1
answer
Two coherent sources hence intensities in the ratio $81 : 4$. The ratio $I_{max} \;and\; I_{min}$ of the interfering light is
jeemain
physics
class12
unit16
wave-optics
interference
easy
asked
Jan 20, 2014
by
meena.p
1
answer
A doubled convex lens of refractive index $\mu$ is kept inside two immiscible liquids of refractive inclines $\mu_1$ and $\mu_2$. as shown $\mu_2 < \mu < \mu _1$ , A parallel beam of light is incident on the lens. After refraction on the lens we will get,
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
difficult
asked
Jan 20, 2014
by
meena.p
1
answer
A person carrying a plane mirror facing his back is moving with a speed of V m/s. Another person is following the mirror at the speed of u m/s. What is the speed of approach of the person to the image in the mirrors.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
asked
Jan 20, 2014
by
meena.p
1
answer
A lens made of material of refractive index $\mu =\large\frac{3}{2} $ when placed in air behaves as shown in figure (1) . But when placed in a medium of refractive index $\mu_s$ it behaves as shown in figure (2) . Then the value of $\mu_s $ is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Jan 20, 2014
by
meena.p
1
answer
A ray of light strikes a material of refractive index $\mu= \sqrt 3$. If the reflected and refracted light are perpendicular to each other, what is the angle of incidence.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 20, 2014
by
meena.p
1
answer
A luminous point is kept inside tank of water at a depth of 10 m below the surface. $\mu$ for water is $\large\frac{4}{3}$ . What must be the minimum diameter of card placed on the surface of water so that it cuts off all the light coming out.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Jan 20, 2014
by
meena.p
1
answer
Plane surface of plane - convex lens is silvered and it then acts like a concave mirror of focal length . 30 cm. If the refractive index of the lens is 1.5 , the radius of curvature of convex surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction-at-spherical-surfaces-and-lenses
medium
asked
Jan 20, 2014
by
meena.p
1
answer
A point object is placed at the centre of a glass sphere of radius 6 and refractive index 1.5 . The distance of the virtual image from the surface of the sphere is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
medium
asked
Jan 20, 2014
by
meena.p
1
answer
White light is incident on the surface of glass and air as shown. Green light just grazes the surface. then the emergent ray in air contains
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
easy
asked
Jan 20, 2014
by
meena.p
1
answer
Two plane mirrors A and B are alligned parallel to each other as shown. A ray of light is incident at an angle $30^{\circ}$ at a point just inside on one end of mirror A. What is the maximum number of reflection the ray undergoes before it emerges out.
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
aims-12-physics
asked
Jan 20, 2014
by
meena.p
1
answer
For a concave mirror as u (object distance ) varies v (the image distance ) also varies. The graph between $\large\frac{1}{u}$ and $\large\frac{1}{v}$
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
reflection-by-mirrors
easy
asked
Jan 20, 2014
by
meena.p
1
answer
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