Question

A concave mirror produces four times a magnified real image of an object. what is the focal length
of the mirror if it is placed at 50 cm from the pole of the mirror?

Answer 1

Explanation:

Given =

magnification by concave mirror = -4cm

object distance, u = -50cm

We know that,

Linear magnification = -v/u

-4 = -v/-50

v = -200 cm

Using the mirror formula,

1/f = 1/v + 1/u = 1/-200 + 1/-50 = 1/-200 -1/50

1/f = 1 -4/-200 = -3/-200 = 3/200

f = 200/3 = 66.6cm

Answer 2

Answer:

Reffered to the attachment

Explanation:

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Warm regards:Miss Chikchiki