Question

An
object is placed at 10 CM in front of a convex mirror .the image is formed at 5cm behind the mirror. find the focal length of the convex mirror​

Answer 1

Answer:

Taking the usual sign convention for mirror =>u=(-)10 cm,v=5 cm=>from the eqn 1/u+1/v=1/f

=>1/5–1/10=1/f=>1/10=1/f=>f=10cm.Ans.

Explanation:

Answer 2

Answer:

u = -10cm

v = 5 cm

1/v + 1/u = 1/f

1/f = 1/5 + 1/-10

1/f = 1/5 - 1/10

1/f = 2–1/10

1/f = 1/10

f = 10cm

hence the focal length in 10 cm

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