Test Index

Wave Optics Part 2

Section: Physics

Question : 29 of 77

Marks: +1, -0

Solution:

Amplitude of light from a slit is proportional to its width. If one slit width is half the other, their amplitudes are in ratio

1:2

. Hence their intensities are in ratio

1:4

. The maximum intensity is proportional to

(A_1+A_2)^2

and the minimum intensity to

(A_1-A_2)^2

. Taking amplitudes as

2

and

1

, the ratio is

(2+1)^2:(2-1)^2 = 9:1

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