1.

An object is placed in front of a concave mirror 20 cm away from it. If its focal length is 40 cm, locate the position of image and its nature.

Answer»

f = – 40 cm, u = – 20 cm

f = \(\cfrac{uv}{u+v}\)

– 40 = \(\cfrac{-20}{-20+u}\)

– 40 ( – 20 + v ) = – 20 v

– 20 + v = -20/-40 = v/2

\(\therefore\) - v/2 = -20

Features of image:

At behind the mirror, very large, virtual, direct.



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