First slide

Coherent sources and their importance in interference

Question

In a Young’s double slit experiment, light of 500 nm is used to produce an interference pattern. When the distance between the slits is 0.05 mm, the angular width (in degree) of the fringes formed on the distance screen is close to :

Easy

A

0.17º
B

0.07º
C

1.7º
D

0.57º

Solution

$a n g u l a r f r i n g e w i d t h = \frac{β}{D} = \frac{λ}{d} = \frac{500 \times 10^{- 9}}{0.05 \times 10^{- 3}} = 10^{- 2} r a d = 0.57 \deg$

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