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There is a small air bubble at the centre of a solid glass sphere of radius $r$ and refractive index $\mu .$ What will be the apparent distance of the bubble from the centre of the sphere, when viewed from outside?
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The correct answer is:
Zero
'
As the object is at centre of the sphere.
$\therefore$ All rays will fall normally on surface, hence they do not deflect. Thus, a virtual image is formed at the
centre $O$.
$\therefore$ Apparent depth $=$ Real depth
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