Question

) Size of image of an object formed by a mirror having a focal length of 20 cm is
observed to be reduced to (1/3)Td of its size.At what distance, the object has been
placed from the mirror? What is the nature of the image and the mirror?​

Answer 1

Explanation:

f=+20 cm. v=-u/3. i/f=1/v+1/u. therefore, u= -40 cm.

Answer 2

Answer:

f=+20 cm.

v=-u/3.

i/f=1/v+1/u.

therefore,

u= -40 cm

Explanation:

@loki