A convex mirror having focal length 20 c...

A convex mirror having focal length 20 cm is used as side glass in car. Driver will find image of car coming behind 6 m away at .....

15.4 cm

17.4 cm

19.4 cm

21.4 cm

Text Solution

Verified by Experts

The correct Answer is:

A, C, D

For mirror `1/f=2/v+1/u`
`therefore 1/v=1/f-1/u`
`=(1)/(20)-(1)/(-600)=(30+1)/(600)=(31)/(600)`
`therefore v=(600)/(31) ~~ `19.4 cm (approx)

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