An air bubble in glass slab of refractiv...

An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is,

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A bubble in glass slab (=1.5) when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is:

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A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 cm from this lens, find the position of the image formed.

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