Question

In Young's double slit experiment, fringe width is \( 1.4 \text{ mm} \) with light of wavelength \( 6000\,\text{\AA} \). If the light of wavelength \( 5400\,\text{\AA} \) is used, with no other change in the experimental set up. The change in fringe width is

• A. $1.26 \text{ mm}$
• B. $0.12 \text{ mm}$
• C. $0.13 \text{ mm}$
• D. $0.14 \text{ mm}$

Hint:

- $\beta \propto \lambda$ - Decrease in wavelength $\Rightarrow$ decrease in fringe width

Answer 1

The Correct Option is D