Q.

In the case of a concave lens, the maximum image distance is :

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a

2F

b

Infinity

c

F

d

4F

answer is A.

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Detailed Solution

  • When an object is placed at infinity, the image is formed at the focus of a concave lens.
  • When the object is placed between the infinity and the optical centre of a concave lens then the image is formed between the focus and the optical centre of the lens.

Therefore, the maximum image distance in the case of a concave lens is F. 

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