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Q.

A  4.5cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Then

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a

 Distance of the image from the mirror is 6.7 cm

b

 Size of the image 2.5 cm 

c

 Distance of the image from the mirror is 7.6 cm

d

 Magnification 5/9

answer is A, B, C.

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Detailed Solution

f=+15cmu=12cmo=4.5cm
 
Using the mirror formula
1f=1v+1uv=6.7cm 
 
m=vu=IOI=2.5cmm=IO=59

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