A travelling microscope is focussed on an ink dot. When a glass slab $(n = 1.5)$ of thickness $9 c m$ is introduced on the dot, the travelling microscope has to be moved by

3 c m

upwards

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5 c m

upwards

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3 c m

downwards

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5 c m

downwards

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Solution

The correct option is D $3 c m$ upwards
Refractive index of the glass slab $n = 1.5$
Thickness of slab $t = 9 c m$
Shift in the position of microscope $x = t (1 - \frac{1}{n})$
$∴$ $x = 9 (1 - \frac{1}{1.5}) = 3 c m$ upwards

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A travelling microscope is focussed on an ink dot. When a glass slab (n=1.5) of thickness 9 cm is introduced on the dot, the travelling microscope has to be moved by

The correct option is D 3 cm upwardsRefractive index of the glass slab n=1.5Thickness of slab t=9 cmShift in the position of microscope x=t(1−1n)∴ x=9(1−11.5)=3 cm upwards

A travelling microscope is focussed on an ink dot. When a glass slab $(n = 1.5)$ of thickness $9 c m$ is introduced on the dot, the travelling microscope has to be moved by

The correct option is D $3 c m$ upwards
Refractive index of the glass slab $n = 1.5$
Thickness of slab $t = 9 c m$
Shift in the position of microscope $x = t (1 - \frac{1}{n})$
$∴$ $x = 9 (1 - \frac{1}{1.5}) = 3 c m$ upwards