Question

calculate the focal length of a spherical mirror that forms 3 times magnified real image of an object placed in front of it.

Answer 1

Concave mirror can produce both real image as well as virtual image. But according to the given condition the concave mirror is producing real and inverted image so

ACQ-

Height =h,height of image is 3h

m=h’/h

m=-3h/h

m=-3

u=-10cm

But we know that m=-v/u

-3=-v/-10

v=-30cm

Hence solved.

Hope it will helpfull to you.

Answer 2

Answer:

Concave mirror can produce both real image as well as virtual image. But according to the given condition the concave mirror is producing real and inverted image so

ATQ-

Height =h,height of image is 3h

m=h’/h

m=-3h/h

m=-3

u=-10cm

But we know that m=-v/u

-3=-v/-10

v=-30cm

Hence solved.

Hope it will helpfull to you.