Question

A parallel beam of monochromatic light of wavelenght $\lambda$ is used in a Young's double slit experiment. The slits are separated by a distance d and the screen is placed parallel to the plane of the slits. The incident beam makes an angle $\theta =si{n}^{-1}\left(\frac{\lambda }{2d}\right)$ with the normal to the plane of the slits. A transparent sheet of refractive index. ${}^{\prime }{\mu }^{\prime }$ and thickness $t=\frac{\lambda }{2(\mu -1)}$ is introduced infront of one of the slit. Find the intensity at the geometrical centre.

• A. I
• B. 2I
• C. 3I
• D. 4I

Answer 1

The correct option is D

4I

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