Question

An object is placed at a distance of 20cm from a convex mirror of focal length 25cm.Calculate the position of the image
Discuss its nature
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Answer 1

Answer: -100

Explanation:

object distance,u=20cm

focal length,f=25cm always taken to be positive because it forms a virtual image on the back of the mirror

using mirror formula we get,

1/f=1/v+1/u

1/25=1/v+1/20

1/25-1/20=1/v

-1/100=1/v

-100=v