Q. 23

The near point of

Answer :

According to the question

Object Distance (u) = -25 cm

Image Distance (v) = -50 cm

By Lens Formula

F = 50 cm.

Since focal length is positive hence the lens is convex lens.

Power =

Focal length = 50 cm = 0.5 m

1 m = 100 cm.

Power =

Hence the Power is 2 Dioptre

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