First slide

Coherent sources and their importance in interference

Question

In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain 5th bright fringe at the same point

Easy

A

500 nm
B

630 nm
C

750 nm
D

420 nm

Solution

$n_{1} λ_{1} = n_{2} λ_{2} \Rightarrow 3 \times 700 = 5 \times λ_{2} \Rightarrow λ_{2} = 420 nm$

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