Question

The real image of half the size of object is obtained in a concave mirror with a centre of curvature of 40
cm. The distance of the object and that of its image from the mirror will be respectively
(a). 15cm & 30cm
(b). 30cm & 15cm
(C). 30cm & 60 cm
(d). 60cm & 30 cm
floncicaualto​

Answer 1

Answer:

Lets, u= object distance

v= image distance

Given, 

R=40cm

f=2R=20cm

magnification, m=2hh=uv (for real image)

v=2u. . . . (1)

By mirror formula,

f1=v1+u1

201=u2+u1

u=60cm

From equation (1),

v=260=30cm

The correct option is D

Explanation:

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