First slide

Coherent sources and their importance in interference

Question

In a Young’s double-slit experiment the fringe width is 0.2 mm. If the wavelength of light used is increased by 10% and the separation between the slits is also increased by 10%, the fringe width will be

Moderate

A

0.20 mm
B

0.401 mm
C

0.242 mm
D

0.165 mm

Solution

$β = \frac{λD}{d}; If λ and d both increase by 10 % there will be no change in fringe width (β)$ .

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