Question

. A concave mirror of radius R=60 cm is placed so that a luminous object is do=20 cm in front of the mirror. Where does the image form di ?

Answer 1

Answer:

Image distance = 60 cm

Explanation:

R = 60 cm

f = R/2 = - 30 cm

u = - 20 cm

1/v + 1/u = 1/f   (mirror formulae)

1/v = 1/f - 1/u

     = - 1/30 + 1/20

     = 1/60

v = 60 cm