Question

an object is placed 20cm from a convex mirror its image is formed 12 cm from the mirror .find the focal length​

Answer 1

Answer:

v = 12 cm

u = -20 cm

1/v + 1/u = 1/f

f = 30 cm

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Answer 2

Answer:

30cm

Explanation:

Given:

u= -20cm

v= 12cm

solution:

1/f= 1/v+1/u

1/f= 1/12-1/20

1/f=(5-3)/60

1/f=2/60

1/f =1/30

f = 30cm

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