Wave Optics True or False _______(a) If the distance between the slits is halved

Question

Wave Optics True or False

_______(a) If the distance between the slits is halved in Young’s experiment, the width of the central maximum is doubled.

_______(b) The distance of the bright fringes from the central maximum must be dependent of color used to perform in Young’s experiment.

_______(c) In a single-slit diffraction experiment, as the width of the single slit is made smaller, the width of the central maximum diffraction becomes smaller.

_______(d) If the diffraction experiment is carried out in water using the same apparatus as in the air, the width of the central maximum in water is the larger than that in air.

_______(e) When a light ray passes through a thin film with the index of refraction greater than that in air, the reflected ray from the surface between the air and film undergoes a quarter-wavelength phase change.

Explanation / Answer

d*sintheta = m*lambda

tan theta = y/D

d = slit distance

y = fringe distance from central

D = screen distance

lambda = wavelength

part a )

if d is d/2

then y = 2y

true

part b )

True , because every color has different wavelength

part c )

true

part d )

false because lambda = lambda/n so here lambda is decreasing

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