First slide

Coherent sources and their importance in interference

Question

In young’s double slit experiment between slits is 0.2 mm and they are 1 m from the screen. Find the distance between 8th maxima and 12th minima, if wavelength of light used is 500 nm.

Moderate

A

2 mm
B

2.5 mm
C

8.75 mm
D

12.75 mm

Solution

$T h e d i s \tan c e b e t w e e n 12 t h m i n i m a a n d 8 t h m a x i m a, = 11.5 \frac{D}{d} λ - 8 \frac{D}{d} λ = 3.5 \frac{D}{d} λ = 3.5 \times \frac{1}{0.2 \times 10^{- 3}} \times 500 \times 10^{- 9} = 8.75 m m$

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