First slide

Young's double slit Experiment

Question

In double slit experiment, the angular width of the fringes is 0.20⁰ for the sodium light $(λ = 5890 Å)$ . In order to increase the angular width of the fringes by 10%, the necessary change in the wavelength is

Moderate

A

Increase of $589 Å$
B

Decrease of $589 Å$
C

Increase of $6479 Å$
D

Zero

Solution

$θ = \frac{λ}{d}; θ$ can be increased by increasing $λ$ , so here $λ$ has to be increased by 10%
i.e., % Increase $= \frac{10}{100} \times 5890 = 589 Å$

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