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Q.

An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. The magnification is


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a

+0.3

b

+0.6

c

-0.3

d

-0.6 

answer is B.

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Detailed Solution

The magnification is +0.6.
Given,
Object distance,
u= -10 cm
Focal length,     f=15 cm
Using the mirror formula,
1f=1v+1u
115=1v-110
1v=110+115
v=25150
v=6 cm
The magnification of the mirror is
m= -vu
     = -6 cm-10 cm
     = +0.6 cm
 
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