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A thin mica sheet of thickness 2 \times 10^{-6} \mathrm{~m} and refractive index \mathrm{(\mu=1.5)} is introduced in the path of the light from upper slit. The wavelength of the wave used is \mathrm{5000\, \AA}. The central bright maximum will shift:

Option: 1

2 fringes upward


Option: 2

2 fringes downward


Option: 3

10 fringes upward


Option: 4

None of these


Answers (1)

best_answer

On introducing mica sheet, fringe shift \mathrm{=\frac{P}{\lambda}(\mu-1) t}

Where, $t$ is thickness of sheet.

So, \mathrm{shift =\frac{\beta}{\left(5000 \times 10^{-10}\right)} \times(1.5-1) \times\left(2 \times 10^{-6}\right)=2 \beta}

So, central bright maximum will shift 2 fringes upward.

Posted by

Irshad Anwar

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