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A travelling microscope is focussed on t...

A travelling microscope is focussed on to a scratch on the bottom of a beaker. Water of refractive index `(4)/(3)` is poured in it. Then the microscope is to be lifted through 2 cm focus it again. Find the depth of water in the beaker.

A

4 cm

B

8 cm

C

`(8)/(7)cm`

D

`(8)/(3) cm`

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The correct Answer is:
B
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - A) Objective Type Questions (One option is correct)
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  8. The least angle of deviation for a glass prism is equal to its refract...

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  9. A light ray of angles of incidence 40^(@) emerged from the prism in mi...

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  10. The angle of minimum deviation for a 75^(@) prism of dense glass is fo...

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  11. Suppose a small angled prism of 6^(@) deviates a ray through 3^(@), th...

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  13. A thin prism of angle 6^(@) made up of glass of refractive index 1.5 i...

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