20%20-%20Wave%20Optics

# 20%20-%20Wave%20Optics - 20 - WAVE OPTICS Page 1 ( Answers...

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20 - WAVE OPTICS Page 1 ( Answers at the end of all questions ) 1 ) Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye ? [ Take wavelength of light = 500 nm ] ( a ) 1 m ( b ) 5 m ( c ) 3 m ( d ) 6 m [ AIEEE 2005 ] 2 ) A Young’s double-slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is ( a ) circle ( b ) hyperbola ( c ) parabola ( d ) straight line [ AIEEE 2005 ] 3 ) If Ι 0 is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled ? ( a ) 4 Ι 0 ( b ) 2 Ι 0 ( c ) Ι 0 / 2 ( d ) Ι 0 [ AIEEE 2005 ] 4 ) When an unpolarized light of intensity Ι 0 is incident on a polarizing sheet, the intensity of light which does not get transmitted is ( a ) Ι 0 / 4 ( b ) Ι 0 / 2 ( c ) Ι 0 ( d ) zero [ AIEEE 2005 ] 5 ) The angle of incidence at which reflected light is totally polarized for reflection from air to glass ( refractive index n ) is ( a ) sin - 1 ( n ) ( b ) sin - 1 ( 1 / n ) ( c ) tan - 1 ( 1 / n ) ( d ) tan - 1 ( n ) [ AIEEE 2004 ] 6 ) The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is ( a ) infinite ( b ) five ( c ) three (d ) zero [ AIEEE 2004 ] 7 ) To demonstrate the phenomenon of interference, we require two sources which emit radiations ( a ) of the same frequency ( b ) of different wavelengths ( c ) of nearly the same frequency ( d ) of the same frequency having a definite phase relationship [ AIEEE 2003 ] 8 ) Which of the following is conserved when light waves interfere with each other ? ( a ) energy ( b ) intensity ( c ) amplitude ( d ) momentum [ AIEEE 2002 ] 9 ) In Young’s double - slit experiment, an electron beam is used. If the velocity of the electrons is increased, ( a ) there will be no interference pattern in the first place ( b ) fringe width increases ( c ) fringe width decreases ( d ) fringe width remains the same [ IIT 2005 ]

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## This note was uploaded on 11/28/2011 for the course PHYSICS 300 taught by Professor Smith during the Spring '06 term at ITT Tech Flint.

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20%20-%20Wave%20Optics - 20 - WAVE OPTICS Page 1 ( Answers...

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