Recent questions tagged class12

A ray of light is incident on a prism of refractive index $\mu =\sqrt 2$ It is found that the deviation caused is $30^{\circ}$ The angle of prism is $60^{\circ}$ What will be the angle between the ray inside the prism and the base of the prism .

asked Jan 24, 2014 by meena.p

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A prism of refractive index $\mu =1.5 $ of vertical angle $6 ^{\circ}$ is placed in front of a mirror. A ray of light is incident normally on one of the face of the prism as shown. What is the total deviation caused by the system.

asked Jan 24, 2014 by meena.p

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Two waves have a phase difference of $\pi $. and they have light intensities I and 9I. What will be the resultant intensity .

asked Jan 24, 2014 by meena.p

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Find the width of central maxima given $\lambda = 5 \times 10^{-5}\;cm$ slit separation $d= 0.15 \;cm$ and distance between screen and slit $D= 2.1 \;m$

asked Jan 24, 2014 by meena.p

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An unpolarised light is incident on a glass plate at polarizing angle $57^{\circ}$ with the normal on a glass plane. The reflected light will be

asked Jan 24, 2014 by meena.p

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In Young's double slit experiment the distance between adjacent fringe is x and L is distance between slit and screen. If d is split separation , then wave length is

asked Jan 24, 2014 by meena.p

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$\int\;\large\frac{1}{1+cos x} \;dx$

asked Jan 24, 2014 by yamini.v

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An interference pattern is observed in a young 's double slit experiment in air. Now this chamber is evacuated and the same light is used we will see .

asked Jan 24, 2014 by meena.p

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Wave nature of light explains the phenomenon of

asked Jan 24, 2014 by meena.p

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A ray of light passes through four transparent media with refractive indices $\mu_1, \mu_2, \mu_3$ and $\mu_4$ as shown. The surface of all media are parallel. The emerging say CD is parallel to incident ray AB, Then ,

asked Jan 24, 2014 by meena.p

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In Lloyd's single mirror experiment A light wave emitted directly from sources s interferes with a wave reflected from a mirror M. The interference pattern is formed on the screen which is kept perpendicular to the mirror and at a distance. $D=1 m$ from the source as shown . If the sources is at a distance of 1 mm from the plane of the mirror what is the fringe width when monochromatic light of 600 nm is incident from the sources

asked Jan 24, 2014 by meena.p

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In a young's double slit experiment illuminated by monochromatic light the slit separation is $0.3\;mm$ and slit- screen separation is $1.5 \;m$. If fourth bright fringe is 1 cm from central bright fringe, the wavelength of light used is

asked Jan 24, 2014 by meena.p

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In a young's double slit experiment the fringe width is $0.05\;mm$ when the distance of screen from slit is $75 \;cm$ . If the distance of screen from the slit is increased by $25 \;cm$ , the fringe width will be

asked Jan 23, 2014 by meena.p

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A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minimum for red light of wavelength $\lambda =650 \;nm$ appear for $\theta =30^{\circ}$?

asked Jan 23, 2014 by meena.p

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What is the angular separation between two lines of $\lambda_1 =5882 \mathring{A}$ and $\lambda_2 =5852 \mathring{A}$ in first order grating with 6000 lines per cm in normal incidence.

asked Jan 23, 2014 by meena.p

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A thin film of oil of $\mu =1.2 $ floats on watch of $\mu_w =\large\frac{4}{3}$. A monochromatic light of wave length $\lambda= 9600 A^{\circ} $ falls normally and it appears dark. What must be minimum change in thickness of oil film which will appear bright if normally reflected by same light.

asked Jan 23, 2014 by meena.p

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A Plastic film of thickness t is placed in the path of one of the interfering wave in the young's double slit experiment and it is found that the central fringe is displaced through a width of 5 fringes . If wavelength of light used is $5890 \mathring{A}$ What is thickness of film used

asked Jan 23, 2014 by meena.p

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Two waves from coherent sources $S_1$ and $S_2$ having wavelength $\lambda$ arrive at a point P and complete destructive interference takes place . The path difference between them is

asked Jan 23, 2014 by meena.p

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Two slit in a young's double slit experiment is separated by a distance d. The screen distance is D and it is illuminated by a light of wavelength $\lambda$. A point 0 on the screen is $\large\frac{2d}{3} $ distance from the point which is directly in front of one of the slits. How far away is 0 from the central bright fringe.

asked Jan 23, 2014 by meena.p

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Two coherent sources of light $S_1 $ and $S_2$ are placed in a line as shown. Two screens are placed perpendicular to $S_1S_2$ at A and B . It is observed that at point P a bright fringe is seen , then at point Q.

asked Jan 23, 2014 by meena.p

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In a Young's double slit experiment at a point P on the screen the light from two slit with a path difference of $\large\frac{\lambda}{6} $ Where $\lambda$ is the wavelength of the incident light . The intensity of light at point P is I. If $I_0$ is maximum intensity then $\large\frac{I}{I_0}$

asked Jan 23, 2014 by meena.p

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In a young's double slit experiment 'd' distance between slit is $0.5\; mm$ and illuminated by light of $\lambda =6000 A^{\circ}$ If screen distance is 2.5m ,thedistance of third bright fringe from centre.

asked Jan 23, 2014 by meena.p

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In a Young's double slit experiment light of $\lambda =5000\mathring{A}$ is incident on two slits. At a point P on the screen the two rays arriving have a path difference of $1 \times 10^{-6} \;m$. If the central fringe (zero) is maxima . What is formed at p.

asked Jan 23, 2014 by meena.p

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Maximum intensity of the interference pattern in a young double slit experiment is I. Distance between slit is $d= 5 \lambda$ where $\lambda $ is wave length of the light source. What will be the intensity of light at a point directly in front of one of the slits. $(D= 50 \lambda)$

asked Jan 23, 2014 by meena.p

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In a Young's double slit experiment 'd' distance between slit is $1 \times 10^{-4}\;m$ and $D=1\; m $. ( distance of screen from slits ) At a point P on the screen the resulting intensity is equal to the intensity due to individual slit $I_0$ The distance of P from central maxima when wavelength of $x=6000\;\mathring{A}$ is

asked Jan 23, 2014 by meena.p

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A polariser and an analyser are oriented so that maximum light is transmitted of intensity $I_0$ What will be the intensity of the out coming light when analyer is rotated through $60^{\circ}$

asked Jan 23, 2014 by meena.p

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In a single slit experiment a wave of wavelength $0.2 \;cm$ is incident normally on a slit of width $0.004\;m$ . What is the semi angular width of the central maxima.

asked Jan 23, 2014 by meena.p

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The first diffraction minima due to a single diffraction is at $30^{\circ}$ for a light of wave length $5000A^{\circ}$ the width of slit is

asked Jan 23, 2014 by meena.p

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The maximum distance a person having defect of short right can see clearly is 4 meters. The power of lens required to correct is

asked Jan 23, 2014 by meena.p

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In Young's double slit experiment if width of slit is made 3 folds, the fringe width becomes

asked Jan 23, 2014 by meena.p

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The contrast in the dark and bright fringes in any interference pattern depends on

asked Jan 23, 2014 by meena.p

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A double convex lens $(\mu =1.5) $ has its focal length 10 cm. What will be its focal length if it is immersed in liquid of $(\mu_1=\large\frac{4}{3})$

asked Jan 23, 2014 by meena.p

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The objective of a telescope has a diameter 5 cm. What is the angular seperation in radius of two starts which can be resolved by the telescope when light of $3000 A^{\circ}$ is used.

asked Jan 23, 2014 by meena.p

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The magnifying power of telescope is 9. when it is adjusted for parallel rays, the distance between objective and eye piece is found to be 20 cm. The focal length of lenses are

asked Jan 23, 2014 by meena.p

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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.

asked Jan 23, 2014 by meena.p

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Light is incident normally on a diffraction grating through first order diffraction is seen at $32^{\circ}$ second order diffraction will be seen at

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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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?

asked Jan 22, 2014 by meena.p

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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.

asked Jan 22, 2014 by meena.p

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Two thin lenses of focal lengths $f_1$ and $f_2$are in contact , the equivalent focal length is

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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The equiconvex lens of glass of $\mu =1.5$ and focal length $15\;cm$ is silvered on one side. It will behave like.

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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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.

asked Jan 22, 2014 by meena.p

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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'

asked Jan 22, 2014 by meena.p

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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 :

asked Jan 22, 2014 by meena.p

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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.

asked Jan 22, 2014 by meena.p

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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

asked Jan 22, 2014 by meena.p

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