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A concave mirror produces three times magnified real image of an object placed at $10 cm$ in front of it. The image is located at__cm?

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30

40

10

90

answer is A.

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Detailed Solution

The image is located at

30 cm

.
The object distance,

u = - 10

, magnification

M = 3

.
Magnification is equal to,

M = \frac{- v}{u}

Here, M = magnification, v = image distance and u = object distance.
Since, the magnification of the mirror is 3 times the original,
Therefore,

3 = \frac{- v}{- 10}

3 = \frac{v}{10}

v = 30 cm

The image is located at

30 cm

the right of the mirror.

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