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A microscope is focused on a mark at the bottom of a beaker. Water having refractive index of is…
A microscope is focused on a mark at the bottom of a beaker. Water having refractive index of $\frac{4}{3}$ is poured into the beaker to a height of 4cm. To bring the mark in focus again, the microscope should be moved:
- (a)1cm upward.
- (b)3cm upward.
- (c)$\frac{4}{3}\text{ cm}$ downward.
- (d)1cm downward.
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From ISC 2026 Improvement Physics Paper 1, question 1(A)(vi).