Question

1. An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Find the position & nature of the image..

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Answer 1

Given :-

An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm

To Find :-

Position and Nature

Solution :-

We know that

1/f = 1/v - 1/u

1/-12 = 1/v - 1/-4

-1/12 = 1/v - (-1/4)

-1/12 = 1/v + 1/4

-1/12 - 1/4 = 1/v

-1 - 3/12 = 1/v

-4/12 = 1/v

-1/3 = 1/v

-3 = v

Position = Same size of object

Natur - Virtual, erect and magnified image