JEE PHYSICS MCQ: WAVE OPTICS

1 Medium

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Application +4 | -1

In young's experiment light of wavelength

4800 ~\mathop {\text{A}}\limits^ \circ

is used. If one slit is covered with glass of refractive index

1.4

and another slit is covered with a film of same thickness having refractive index

1.7,

the centre fringe shifts to the position of

5^{\text {th}}

bright fringe then find the thickness of film.

View answer and explanation

Correct option: D

8 \times 10^{-3} \mathrm{~mm}

Option D (

8 \times 10^{-3} \mathrm{~mm}

) is correct because it is the thickness calculated using the formula for fringe shift due to introducing films of different refractive indices:

t(\mu_1 - \mu_2) = n\lambda

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