Student Login

Home›Chapters›Wave Optics PYQs›YDSE: Fringe Width & Fringe Positions›Question 63

JEE Main 2020 (9 Jan, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from JEE Main 2020 (9 Jan, Shift 2)

Q63JEE Main 2020 · 9 JAN · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

In a Young's double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength $\lambda$ is used. Then the value of $\lambda$ is (in nm) __________.

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 750

Same section: $n_1\lambda_1 = n_2\lambda_2$
$\lambda = \frac{15 \times 500}{10}$
So $\lambda = 750$ nm.

Report a mistake

More questions on YDSE: Fringe Width & Fringe Positions

In a Young’s double slit experiment, light of 500 nm is used to produce an interference…JEE Main 2020 (3 Sep, Shift 1)
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart…JEE Main 2020 (2 Sep, Shift 1)
In a Young's double slit experiment, the separation between the slits is 0.15 mm. in the…JEE Main 2020 (7 Jan, Shift 2)
In a Young's double slit experiment, if there is no initial phase difference between the…NEET 2019
In a Young’s double slit experiment with slit separation 0.1 mm, one observes a bright…JEE Main 2019 (10 Jan, Shift 1)
In Young’s double slit experiment the separation d between the slits is 2 mm, the…NEET 2018
In Young’s double slit experiment, the distance between slits and the screen is 1.0 m and…JEE Main 2016 (9 Apr, Shift 1)
In Young's double slit experiment the distance between the slits and the screen is…NEET 2013