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The figure shows a transparent slab of length 1 m placed in air whose refractive index in x direction varies as 
. The optical path length of ray R will be
The figure shows a transparent slab of length 1 m placed in air whose refractive index in x direction varies as . The optical path length of ray R will be
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A parallel beam of light 500 nm is incident at an angle 30° with the normal to the slit plane in a young's double slit experiment. The intensity due to each slit is Io. Point O is equidistant from 
and 
. The distance between slits is 1 mm.
A parallel beam of light 500 nm is incident at an angle 30° with the normal to the slit plane in a young's double slit experiment. The intensity due to each slit is Io. Point O is equidistant from and . The distance between slits is 1 mm.
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In a Young's Double slit experiment, first maxima is observed at a fixed point P on the screen. Now the screen is continuously moved away from the plane of slits. The ratio of intensity at point P to the intensity at point O (centre of the screen)
In a Young's Double slit experiment, first maxima is observed at a fixed point P on the screen. Now the screen is continuously moved away from the plane of slits. The ratio of intensity at point P to the intensity at point O (centre of the screen)
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An YDSE is carried out in a liquid of refractive index 
and a thin film of air is formed in front of the lower slit as shown in the figure. If a maxima of third order is formed at the origin O, find the thickness of the air film. The wavelength of light in air is 
and D/d=1000.
An YDSE is carried out in a liquid of refractive index and a thin film of air is formed in front of the lower slit as shown in the figure. If a maxima of third order is formed at the origin O, find the thickness of the air film. The wavelength of light in air is and D/d=1000.
Physics-General
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Two coherent radio point sources that are separated by 2.0 m are radiating in phase with a wavelength of 0.25 m. If a detector moves in a large circle around their midpoint, at how many points will the detector show a maximum signal ?
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Two coherent narrow slits emitting light of wavelength 
in the same phase are placed parallel to each other at a small separation of 
. The light is collected on a screen S which is placed at a distance 
from the slit as shown in figure. Find the finite distance x such that the intensity of P is equal to intensity at O.
Two coherent narrow slits emitting light of wavelength in the same phase are placed parallel to each other at a small separation of . The light is collected on a screen S which is placed at a distance from the slit as shown in figure. Find the finite distance x such that the intensity of P is equal to intensity at O.
Physics-General
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Consider the arrangement shown in figure. By some mechanism, the separation between the slits 
and 
can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of 
and 
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1) 
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3) 
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Consider the arrangement shown in figure. By some mechanism, the separation between the slits and can be changed. The intensity is measured at the point P which is at the common perpendicular bisector of and . When , the intensity measured at P is I. Find this intensity when z is equal to
1) ,
2) , and
3) .
Physics-General
Maths-
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In Young's double slit experiment and are two slits. Films of thicknesses 
and 
and refractive indices 
and 
are placed in front of and respectively. If 
, then the central maximum will :
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Physics-General
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Two coherent sources are placed 0.9 mm apart and the fringes are observed one metre away. The wavelength of monochromatic light used if it produces the second dark fringes at a distance of 10 mm
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Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are
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Bright colours exhibited by spider's web, exposed to sunlight are due to
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Two light beams produce interference pattern to give maxima and minima on the screen. If the intensities of the light beams are in the ratio of 9:4, then the ratio of intensities of maxima and minima is
Two light beams produce interference pattern to give maxima and minima on the screen. If the intensities of the light beams are in the ratio of 9:4, then the ratio of intensities of maxima and minima is
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The axes of the polariser and analyser are inclined to each other at 60° If the amplitude of polarised light emergent through analyzer is A The amplitude of unpolarised light incident on polariser is
The axes of the polariser and analyser are inclined to each other at 60° If the amplitude of polarised light emergent through analyzer is A The amplitude of unpolarised light incident on polariser is
Physics-General
