In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is us - Physics MCQ NEET 2022 2026 | ExamTest.live

mediumMCQNEET 20222026Physics

1 mark

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

Solution & Step-by-step Explanation

The width of the segment of the screen W is constant and is given by W = n β = n \frac{λ D}{d} .Since D and d are constant for the experiment: n_{1} λ_{1} = n_{2} λ_{2} Given n_{1} = 8, λ_{1} = 600 nm, and λ_{2} = 400 nm . 8 \times 600 = n_{2} \times 400 n_{2} = \frac{4800}{400} = 12

Try it yourself before checking the explanation above.

In a Young's double slit experiment, a student observes 8 fringes in a certain segment of screen when a monochromatic light of 600 nm wavelength is used. If the wavelength of light is changed to 400 nm, then the number of fringes he would observe in the same region of the screen is:

6

8

9

12

Practice with timed mock tests and track your performance across Physics.