Physics-Wave Optics

Test Preparation on Physics-Wave Optics

1.

The ratio of amplitudes of the waves coming from two slits having widths in the ratio 4: 1. is

11 : 2
22 : 1
31 : 4
44 : 1

2.

The resultant intensity after interference of two coherentwaves respresented by y1= a1cos wt andy2 = a2 cos a2cos (p/2 - wt ) will be

1a1 - a2
2a1 + a2
3a12 - a22
4a12 - a22

The two waves differ in phase by p/2 I = (a12+a22)

3.

A ray of light is coming from the source S. If a thin film of thickness t and refractive index p is placed in its path, the increase in length of the optical path is :

1mt
2m/t
3(m - 1)t
4none of these

4.

The ratio of intensities in consecutive maxima in a diffraction pattern due to a single slit is :

11 : 2 : 3
21 : 4 : 9
31 : 2/p2 : 3/p2
41 : 4/9p2:4/25p2

1 : (2/3p)2:(2/5p)2 or 1 : 4/9p2 :4/25p2

5.

In Young's double slit experiment, if wavelength of lightchanges from l1 and l2 to and distance of seventh maximachanges from d1 to d2 then :

1d1/d2 - l1/l2
2d1/d2 = l2/l1
3d1/d2 = (l1/l22)2
4d1/d2 = (l1/l2)2

d1 = 7 l1 D/d d2 = 7 l2 D/d d1/d2 = l1/l2

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