1.

An object is placed at a distance `20cm` from the pole of a convex miror of focal length `20cm`. The image is produced aA. `13.3cm`B. `20cm`C. `25cm`D. `10cm`

Answer» (d) `u=-20cm, f=20cm`
From mirror formula `1/f=1/v+1/u`
`1/20=1/v+1/(-20)`
`1/v=1/20+1/20`
`1/v=1/20+1/20`
`1/v=2/20`
`impliesv=10cm`


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