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Aditi Hemendra Vaidya
Asked: 2022-11-11T23:28:07+05:30 In:

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5
A. 2 cm upwards
B. 2 cm downwards
C. 1 cm upwards
D. 1 cm upwards

A microscope is focussed on an ink mark on the top of a table. If we place a glass slab of 3 cm thick on it, how should the microscope be moved to focus the ink spot again? The refractive index of glass is 1.5
A. 2 cm upwards
B. 2 cm downwards
C. 1 cm upwards
D. 1 cm upwards
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  1. Correct Answer – C
    (c ) Given, n=1.5, and `h_(o)=3cm`
    Refractive index, `n=h_(o)/h_(i) rArr 1.5=3/h_(i)`
    Apparent depth , `h_(i)=3/1.5=2 cm`
    Hence, 3-2=1 cm upwards.

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