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Q.

Which instruments are spherical materials bounded by two spherical surfaces?

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a

lenses

b

mirrors

c

slabs

d

None of these

answer is A.

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Detailed Solution

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Lenses are spherical materials bounded by at least one spherical surface.

Two types of lens are :

1.Concave : Thicker in the middle and thinner at the edges.

2.Convex : Thinner in the middle and thicker at the edges.

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