Question

size of image of an object formed by mirror having a focal length of 20 cm is observed to be reduced 1/3 of its size at what distance the object has been placed from the mirror what is the nature of image and mirror.​

Answer 1

Answer:

80 cm

Explanation:

Using magnification formula,

m= -v/u=1/3=v= -u/3

From mirror formula,

1/v+1u=1/f

from above to equation,

3/-u+1/-u=1/20

u=−80 cm

So, the object is placed at a distance of 80cm in front of the mirror.

thankyou

Answer 2

Answer:

80 centimetres

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