The critical angle for a certain wavelength of light is glass is `40^(@)`. Calculate the polarising angle and the angle of refraction in glass corresponding to it.
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A soap flim of thickness `0.3 mu m` appears dark when seen by the refracted light of wavelength `580 nm`. What is the index of refraction of the soap
Correct Answer - 1.45 The path difference is `2mu t`. Now for destructive interface it can be `2mut=(lambda)/(2)` or `(3lambda)/(2)` or `(5lambda)/(2)` and so on……… `mu=(lambda)/(4 t),(3lambda)/(4 t),(5lambda)/(4 t)……..` `=(580xx10^(-9))/(4xx0.3xx10^(-6)) ,...
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In YDSE pattern with light of wavelength `lambda_1 = 500nm`, 15 fringes are obtained on a certain segment of screen. If number of fringes for light of
Correct Answer - 750 nm
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A ray of light is incident upon one face of a prism in a direction perpendicular to the other refracting face. The critical angle for glass – air inte
Correct Answer - `cot A lt (sqrt(3)-1)` where A is angle of the prism.
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A sheet of cellophane acts as a half-wave plate for light of wavelength 4000Å. If the index of refraction did not change with wavelength, how would th
Correct Answer - It will behaves as a quarter-wave plate
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Given that a photon of light of wavelength 10,000Å has an energy equal to 1.23eV. When light of wavelength 5000Å and intensity `I_(0)` falls on a phot
Correct Answer - (i) 1.1 eV (ii) `1.6 xx 10^(-6) A` ; unchanged
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Unplarised light falls on two polarising sheets placed one on the top of the other what must be the angle between the characteristic directions of the
Correct Answer - `+-55^(@),+-35^(@)`
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Yellow light is incident on a smooth surface of a block of dense flint glass for which the refractive index is 1.6640. Find the polarising angle and t
Correct Answer - `59^(@),31^(@)`
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A quartz plate is a half wve plate for light whose wave length. Is `lambda`. Assuming that the variations is the indices of refraction with wavelength
Correct Answer - Plane will behave as a quarter wave plate for wavelength `lambda`
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Calculate the index of refraction of a liquid from the following into glass: (a) Reading for the bottom of an empty beaker: 11.324 cm (b) Reading for
Correct Answer - 1.437
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When a light ray passes from a denser medium into a rarer medium, the angle of incidence for which the angle of refraction is maximum is called ______
Correct Answer - Critical angle
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