First slide

Spherical/Curved mirrors

Question

A concave mirror is used to focus the image of a flower on a nearby well 120 cm from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be

Moderate

A

8 cm
B

12 cm
C

80 cm
D

120 cm

Solution

$Let distance = u . Now \frac{v}{u} = 16 and v = u + 120 ∴ \frac{120 + u}{u} = 16 \Rightarrow 15 u = 120 \Rightarrow u = 8 cm$

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