To see $2$ times magnified image in concave mirror, object should be placed at $x c m$ from mirror. Find $x$ . $(f = 40 c m)$

10 c m

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20 c m

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30 c m

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80 c m

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Solution

The correct option is B $20 c m$
For mirror magnification can be iven as
$m = \frac{f}{f - u}$
$+ 2 = \frac{- 40}{- 40 + x}$
$- 80 + 2 x = - 40$
$2 x = 40$
$x = 20 c m$

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To see 2 times magnified image in concave mirror, object should be placed at x cm from mirror. Find x. (f=40 cm)

The correct option is B 20 cmFor mirror magnification can be iven as m=ff−u +2=−40−40+x −80+2x=−40 2x=40 x=20 cm

To see $2$ times magnified image in concave mirror, object should be placed at $x c m$ from mirror. Find $x$ . $(f = 40 c m)$

The correct option is B $20 c m$
For mirror magnification can be iven as
$m = \frac{f}{f - u}$
$+ 2 = \frac{- 40}{- 40 + x}$
$- 80 + 2 x = - 40$
$2 x = 40$
$x = 20 c m$