First slide

Coherent sources and their importance in interference

Question

In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light

Moderate

A

$5000 Å$
B

$6000 Å$
C

$7000 Å$
D

$9000 Å$

Solution

$Position of 3^{rd} bright fringe x_{3} = \frac{3 Dλ}{d} \Rightarrow λ = \frac{x_{3} d}{3 D} = \frac{(0 .9 \times 10^{- 2}) \times (0 .28 \times 10^{- 3})}{3 \times 1 .4} = 6000 \overset{0}{A}$

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