Recent questions tagged unit16

White light is used in a YDSE with $D= 1m$ and $d= 0.9 mm$ .Light reaching the screen at position $y= 1 mm$ is passed through a prism and its spectrum is obtained. The missing lines in the visible region of this spectrum is :-

asked Feb 13, 2014 by meena.p

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Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ Find the distance of 1000 th maxima

asked Feb 13, 2014 by meena.p

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Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ .Then the distance of 5th minima from central maxima on screen is :-

asked Feb 13, 2014 by meena.p

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Find the maxima and minima obtained on screen in a $YDSE, D= 1m,d=1mm$ and $ \lambda=\large\frac{1}{2}\;mm$

asked Feb 13, 2014 by meena.p

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In a YDSE, $D = 1m \; d= 1mm$ and $\lambda =\large\frac{1}{2}$$mm$ Then the distance between the first and central maxima on screen

asked Feb 13, 2014 by meena.p

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Light from two sources , each of same frequency and travelling in same direction. but with intensity in ratio 4:1 interface. Find ratio of maximum to minimum intensity.

asked Feb 13, 2014 by meena.p

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$S_1$ and $S_2$ are two sources of light which produce individually disturbance at a point P given by $\in _1=3 \sin wt,\;\in _2 =4 \cos wt$ Assuming $\overrightarrow {\in_1}$ and $\overrightarrow{\in_2}$ to be along the same line then result of their superposition is

asked Feb 13, 2014 by meena.p

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A pin is placed $10 cm$ in front of a convex lens of focal length $20 cm$ made of a material having refractive index $1.5$. The surface of lens is further away from P in is silvered and has a radius of curvature $22 \;cm$ Then position of final image will be :

asked Feb 13, 2014 by meena.p

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The focal length of a Plano convex lens when curved surface is silvered and object is in front of plane surface is :-

asked Feb 13, 2014 by meena.p

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The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is

asked Feb 13, 2014 by meena.p

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Two convex lenses of focal length 20 cm are placed co axially with separation of 60 cm between them. Find image of distant object.

asked Feb 12, 2014 by meena.p

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Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length. Find focal length of combination.

asked Feb 12, 2014 by meena.p

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A lens has a power of +5 diopters in air. What will be power if completely immersed in water? $_a \mu_w =\large\frac{4}{3}$ and $_a \mu_g =\large\frac{3}{2}$

asked Feb 12, 2014 by meena.p

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A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters.Then the power and focal length is

asked Feb 12, 2014 by meena.p

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An object is placed at an of 45 cm from a converging lens of focal length 30 cm . A mirror of radius of curvature 40 cm is to be placed on other side of lens so that the object coincides with its image. Find the distance of mirror from lens if mirror is convex.

asked Feb 12, 2014 by meena.p

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An object is placed at a distance of 10 cm to left on axis of a convex lens A of focal length 20 cm.Another convex lens of focal length 10 cm is placed co-axially to the right of the lens A at a distance of 5 cm from A. Find the magnification of final image

asked Feb 12, 2014 by meena.p

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A glass convex lens of refractive index $\large\frac{3}{2}$ has got a focal length equal to $50 \;cm$ Find the focal length of lens if it is immersed in ethyl alcohol of $refractive index \;1.36$

asked Feb 12, 2014 by meena.p

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A parallel beam of light travelling in water $(\mu =\large\frac{4}{3})$ is refracted through a spherical air bubble of radius R .. Find the location of image formed after refraction at two surfaces.

asked Feb 12, 2014 by meena.p

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A prism of crown glass refracting angle of $50^{\circ}$ and mean refractive index $=1.51$ is combined with one flint glass prism of refractive index $=1.65$ to produce no deviation Then the angle of flint glass is

asked Feb 12, 2014 by meena.p

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The dispersive power of crown and flint glasses are 0.03 and 0.05 respectively . If difference in refractive indices of blue and red colours is 0.014 for crown glass and 0.023 for flint glass . Then the angle of two prisms for a deviation of $10^{\circ}$ (with out dispersion )

asked Feb 12, 2014 by meena.p

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Calculate the dispersive power for crown glass from given data. $\mu_v= 1.523 $ and $\mu_R=1.5145$

asked Feb 12, 2014 by meena.p

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Find the dispersion produced by a thin prism of $18^{\circ}$ having refractive index fro red light $= 1.56$ and for violet light $=1.68$

asked Feb 12, 2014 by meena.p

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What should be the value of refractive index n of a glass rod placed in air, so that the light entering through the flat surface of rod does not cross the curved surface of rod.

asked Feb 12, 2014 by meena.p

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What should be the value of angle $\theta$ so that light entering normally through the surface AC of a prism of refractive index $(n= \large\frac{3}{2})$ does not cross the second refracting surface AB.

asked Feb 12, 2014 by meena.p

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Find angle of refraction in a medium $(\mu =2)$ . If light is incident in vacuum making angle equal to twice the critical angle.

asked Feb 12, 2014 by meena.p

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Find maximum angle that can be made in glass medium $(\mu =1.5)$ if a light ray is refracted from glass to vacuum.

asked Feb 11, 2014 by meena.p

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Find lateral shift of light ray while is passes through a parallel glass slab of thickness 10 cm placed in air.The angle of incidence in air is $60^{\circ}$ and angle of refraction in glass is $45^{\circ}$

asked Feb 11, 2014 by meena.p

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A layer of oil 3 cm thick is floating on a layer of colored water 5 cm thick refractive index of colored water is $\large\frac{5}{3}$ and apparent depth of two liquids appears to be $\large\frac{36}{7}$cm. Then refractive index of oil:

asked Feb 11, 2014 by meena.p

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Refractive index of glass with respect to water is $1.125$ . If the absolute refractive index of glass is $1.5 $ find the absolute refractive index of water.

asked Feb 11, 2014 by meena.p

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A ray of light is incident on a transparent glass slab of refractive index $1.62$ . If the reflected and refracted rays are mutually perpendiculars, what is angle of incidence?

asked Feb 11, 2014 by meena.p

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Light is incident formals on as oil at an incident angle of $30^{\circ}$ After moving through the oil -1, oil-2, and glass it exters water . If the refraction index of glass and water are 1.5 and 1.3 respectively . Then the angle which the ray makes with normal in water .

asked Feb 11, 2014 by meena.p

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Find speed of light in medium 'a' if speed of light in medium 'b' is $\large\frac{c}{3}$ where $c=$ Speed of light in vaccum and light refracts from medium 'a' to medium 'b' making $45^{\circ}$ and $60^{\circ}$ respective with normal.

asked Feb 11, 2014 by meena.p

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Find angle $\theta_a$ made by light ray when it gets refracted from water to air as shown .

asked Feb 11, 2014 by meena.p

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A light ray is incident on a glass sphere at angle of incidence $60^{\circ}$ as shown. then the total deviation after two refraction is :

asked Feb 11, 2014 by meena.p

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A person looks in to a spherical mirror . The size of image of his face is twice the actual size of his face. If the face is at distance 20 cm then find the radius of curvature of mirror.

asked Feb 11, 2014 by meena.p

2 answers

An extended objected is placed perpendicular to principal axis of a concave mirror of radius of curvature 20 cm at a distance of 15 cm from pole. Find the lateral magnification produced

asked Feb 11, 2014 by meena.p

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If a luminous point is moving at a speed $V_0$ towards spherical mirror of focal length f along its axis, Find the speed of image.

asked Feb 11, 2014 by meena.p

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A thin rod of length $\large\frac{f}{3}$ is placed along optical axis a concave mirror of focal length f such that its image which is real and elongated just touches rod . calculate the magnification.

asked Feb 11, 2014 by meena.p

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An object of length $2.5\;cm$ is placed at a $1.5\; f$ from a concave mirror where f is magnitude of focal length of mirror. The length of object is perpendicular to principal axis . Then which of following will be correct . (i) image is 5 cm long (ii) image is 10 cm long (iii) image is inverted (iv)image is erect

asked Feb 11, 2014 by meena.p

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The velocity of image will be :

asked Feb 11, 2014 by meena.p

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An object moves with 5 m/s towards right while mirror moves with 1 m/s towards the left as shown. Find velocity of image.

asked Feb 11, 2014 by meena.p

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Two plane mirrors are inclined to each other such that a ray of light incident on first mirror and parallel to second is reflected from second mirror parallel to first mirror. Find angle between two mirrors.

asked Feb 11, 2014 by meena.p

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There is a point object and a plane mirror . If the mirror is moved by 10 cm away from object , find distance which the image will move by

asked Feb 10, 2014 by meena.p

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A Point source of light B is placed at a distance L in front of centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to mirror at a distance 2L from it as shown. Find greatest distance over which he can see the image of light source in mirror.

asked Feb 10, 2014 by meena.p

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Minimum size of plane mirror, required to see full image of an observer is :

asked Feb 10, 2014 by meena.p

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Find region on Y axis in which reflected rays are present object is at A(2,0) and MN is a plane mirror as shown:

asked Feb 10, 2014 by meena.p

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The image of object A in mirror MN will be

asked Feb 10, 2014 by meena.p

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What is intensity of electric field in the depletion region of which $2.5 \times 10^{-7} m$ if the potential barrier is $0.50 v$

asked Jan 27, 2014 by meena.p

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A plate of thickness x made of refractive index $\mu $ is placed in front of one of the slits in a double slit experiment. What should be minimum thickness x . so that the central maxima turns to fringe with minimum intensity

asked Jan 24, 2014 by meena.p

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Equi convex lens is placed such that optic axis coincides with the x-axis, position of object is $(-40 \;cm, 1 \;cm) $ and position of image $(50 \;cm, -2\;cm) $ where is the lens located

asked Jan 24, 2014 by meena.p

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