Question

What will be the size of image formed of an object 4cm tall placed 20cm in front of a concave mirror of focal length 15cm

Answer 1

Answer:

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Answer 2

Answer:

Height of image is -12cm.

Explanation:

h=4cm

u= -20cm

f= -15cm

According to mirror formula,

1/f=1/v+1/u

1/(-15/=1/v+1/(-20)

-1/15=1/v-1/20

-1/15+1/20=1/v

(-20+15)/300=1/v

-5/300=1/v

-1/60=1/v

v= -60cm

According to magnification formula,

h'/h= -v/u

h'/4= -(-60)/(-20)

h'/4= -3

h'= -3×4

h'= -12cm

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