Question

an object of size 2cm is placed 20cm in front of a spherical mirror and an image is formed 10cm behind the mirror. Calculate the (1) focal length of the mirror (2) size of the image. ​

Answer 1

Answer:

As we know,

>> 1/f=1/u+1/v

>> 1/f=1/-20+1/10

>> 1/f=1-2/20

>> 1/f=1/-20

>> F= -20 (by resprocal in both side)

Explanation: