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Q.

Lens maker’s formula is applicable to

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a

Thick lenses and for marginal rays

b

Thin lenses and paraxial rays which subtend very small angles with the principal axis

c

Thick lenses and paraxial rays which subtend very small angles with the principles axis

d

Thin lenses and for marginal rays

answer is A.

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Detailed Solution

In thin lens the distance of separation between the two surfaces is small. The assumption used in the derivation of the lens maker formula is that the image distance after refraction from the first surface is equal to the object distance for refraction from the second surface. 

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