Student Login

Home›Chapters›Wave Optics PYQs›YDSE: Film, Medium & Two Wavelengths›Question 58

JEE Main 2019 (12 Apr, Shift 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from JEE Main 2019 (12 Apr, Shift 1)

Q58JEE Main 2019 · 12 APR · SHIFT 1Medium

YDSE: Film, Medium & Two Wavelengths

In a double slit experiment, when a thin film of thickness t having refractive index $\mu$ . is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is ( $\lambda$ is the wavelength of the light used):

Show answer and solution

Answer: (d)

Film adds path $(\mu - 1)t$ ; a shift of one fringe means this equals $\lambda$ .
$(\mu - 1)t = \lambda \Rightarrow t = \dfrac{\lambda}{\mu - 1}$
So the answer is (d) $\frac{\lambda}{(\mu - 1)}$ .

Report a mistake

More questions on YDSE: Film, Medium & Two Wavelengths

The figure shows a Young's double slit experimental setup. It is observed that when a…JEE Main 2019 (9 Apr, Shift 1)
In Young's double slit experiment fifth dark fringe is formed opposite to one of the…MHT CET 2019 (3 May, Shift 1)
Consider a Young’s double slit experiment as shown in figure. What should be the slit…JEE Main 2019 (10 Jan, Shift 2)
In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of…JEE Main 2019 (9 Jan, Shift 2)
Young's double slit experiment is first performed in air and then in a medium other than…NEET 2017
In a Young’s double slit experiment, slits are separated by 0.5 mm, and the screen is…JEE Main 2017
The intensity at the maximum in a Young's double slit experiment is I 0. Distance between…NEET 2016 (Phase 1)
Using monochromatic light of wavelength λ, an experimentalist sets up the Young's double…JEE Main 2014 (9 Apr, Shift 1)