Wave optics – JEE First

JEE Advanced 2019 Paper 2, Question 7

In a Young’s double slit experiment, the slit separation $d$ is 0.3 mm and the screen distance $D$ is 1 m. A parallel beam of light of wavelength 600 nm is incident on the slits at angle $\alpha$ as shown in figure. On the screen, the point $O$ is equidistant from the slits and distance $P O$ is 11.0 mm. Which of the following statement(s) is/are correct?

Rendered by QuickLaTeX.com

For $\alpha=\frac{0.36}{\pi}$ degree, there will be destructive interference at point $O$ .
For $\alpha=0$ , there will be constructive interference at point $P$ .
For $\alpha=\frac{0.36}{\pi}$ degree, there will be destructive interference at point $P$ .
Fringe spacing

…

Category: Wave optics

Oblique beam on a double slit