Question

When an object is placed before a mirror at a distance of 10cm and image is formed on a screen at a distance 15cm from the mirror
a)Is the image real or virtual?
b)Identify the mirror used here?
c)Calculate the focal length of the mirror?

Answer 1

Answer:

A) It is real image because it is visible on the screen

B) Concave mirror is used.

C) u=-10cm

v=-15 cm

1/f=1/v+1/u

1/f=-1/15-1/10

1/f=-5/30

f=-6 cm