Question

calculate the focal length of a spherical mirror which forms a 1/3 times virtual image Of an object placed in 18 cm in front of it.what type of mirror​

Answer 1

Answer

THIS IS CONVEX MIRROR

m = 1/3

v = 18 cm

also, m = -v/u

u = -v/ m

u= -18*3 = 54 cm

1/f = 1/u + 1/v

=1/54+1/18 = 4/54

f = 54/4 = 13.5 cm