Question

A convex lens of focal length 20 cm is placed coaxially with a concave mirror of radius of carvature

Answer 1

Answer:

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Explanation:

For convex lens,

U= -60cm

f=+ 20 cm

by using lens formula

1/f= 1/v - 1/u

1/v -1/(-60) =1/20

v1= 30 cm

u=15cm

R=+20 cm

using mirror formula

2/R=1/u+v

2/20= 1/15+1/u

v2=30 cm