First slide

Coherent sources and their importance in interference

Question

In a Young’s double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is:

Easy

A

5.9 mm
B

3.9 mm
C

4.9 mm
D

6.9 mm

Solution

$F r i n g e W i d t h = β = \frac{λ D}{d} = \frac{589 \times 10^{- 9} \times 1.5}{0.15 \times 10^{- 3}} = 5.9 m m$

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