If the distances of an object and its virtual image from the focus of a convex

Question

If the distances of an object and its virtual image from the focus of a convex lens of focal length f are 1 cm each, then f is _______________

Options:

A . 4 cm

B . (√2 +1) cm

C . 2√2 cm

D . ( 2 + √2 ) cm

Answer: Option B

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