Question

A convex mirror produces a magnification of 1/2 when an object is placed at distance of 60cm from it. Where the object should be placed, so that size of image becomes 1/3 of that of object? ​

Answer 1

Answer:

look below

Explanation:

In first case when magnification is 1/2

-v/u=1/2

u=-2v

(From mirror formula )

1/30+1/15=1/f

f=10cm

Thus focal length =10cm

In second case.

-v/u=1/3

u=-3v

(From mirrors formula )

-1/3v+1/v=1/20

2/3v=1/10

v=20/3cm

Since, u=-3v

Therefore,u=-3*20/3

u=-20cm

Justification:-

m= -v/u

1/3=-20/3*-1/20

1/3=1/3

Therefore, the object should be placed at a distance of 20cm.

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Ahh~ there you go =o=

Hope this was helpful

Thank you! :)

Answer 2

The Object Should Be Placed at 20 cm.......

Best of Fluck....

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