A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?
1 cm upward
4.5 cm downward
2 cm upward
1 cm downward
A
4.5 cm downward
B
1 cm upward
C
2 cm upward
D
1 cm downward
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Solution
Verified by Toppr
Shifting in microscope = upward shifting in mark
= t(1−1μ) = 3(1−11.5) = 1 cm
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