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A thin plano-convex lens of focal  is split into two halves. One of the halves is shifted along the optical axis. The separation between object and image plane is 1.8 m. The magnification of the image formed by one of the half lens is 2. Find the focal-length of the lens and separation between the two halves

a)

0.1 m

b)

0.4 m

c)

0.9 m

d)

1 m



Question ID - 152606 | SaraNextGen Top Answer

A thin plano-convex lens of focal  is split into two halves. One of the halves is shifted along the optical axis. The separation between object and image plane is 1.8 m. The magnification of the image formed by one of the half lens is 2. Find the focal-length of the lens and separation between the two halves

a)

0.1 m

b)

0.4 m

c)

0.9 m

d)

1 m

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

This is a modified displacement method problem

Here,m and

Solving we get m

m

127 votes


127