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A dentist concave mirror has a radius of curvature of 30 cm. How far must be placed from a small cavity in order to give a virtual image magnified five times?

Posted by Sai Prasad Patra 6 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 5 months ago

R = 30 cm,

f =- 30/2 = -15cm ( Negative sign for cancave mirror)

m = 5

We know that m= - v/u

Therefore (-5u) =( v)

Using (1/v) + (1/u) = (1/f )

(1/-5u) + ( 1/u) = (1/-15)

Therefore, (5u /4) = -15

Thus, u = -12 cm

The object should be placed at a distance of 12cm from the mirror to get 5 times magnified image.

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CBSE > Class 10 > Science