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A vessel ABCD of 10 cm width has two sma...

A vessel ABCD of 10 cm width has two small slits `S_(1)` and `S_(2)` sealed with identical glass plates of equal thickness. The distance between the slits is 0.8 mm. POQ is the line peropendicular to the plane AB and passing through O, the middle point of `S_(1)` and `S_(2)`. A monochromatic light source is kept at S, 40 cm below P and 2 m form the vessel to illuminate the slits as shown in figure .Calculate the position of the central bright fringe on the other wall CD with respect to line OQ. Now , a liquid is poured into the vessel and filled up to OQ. The central bright fringe is found to be at Q. Calculate the refractive index of the liquid to the liquid.

A

4 cm

B

6 cm

C

5 cm

D

2 cm

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The correct Answer is:
D
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A vessel ABCD of 10 cm width has two small slits S_(1) and S_(2) sealed with idebtical glass plates of equal thickness. The distance between the slits is 0.8 mm . POQ is the line perpendicular to the plane AB and passing through O, the middle point of S_(1) and S_(2) . A monochromatic light source is kept at S, 40 cm below P and 2 m from the vessel, to illuminate the slits as shown in the figure. Calculate the position of the central bright fringe on the other wall CD with respect of the line OQ . Now, a liquid is poured into the vessel and filled up to OQ . The central bright fringe is fiund to be at Q. Calculate the refractive index of the liquid.

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AAKASH SERIES-WAVE OPTICS-LECTURE SHEET EXERCISE-I (LEVEL -II) (ADVANCED )staright Objective Type Questions
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