A thin rod of 5 cm length is kept along the axis of a concave mirror of 10 cm focal length such taht its image is real and magnified and one end touches the rod. Its magnification will be-
Text Solution
Verified by ExpertsThe correct answer is:
B
End A of the rod acts as an object for mirror and A' will be its image so
|u| = (2f – λ )
= (20 – 5) = 15 cm
By mirror formula
= 
+ 
⇒ 
= 
+ 
⇒ 
= – 
⇒ V = – 30 cm
Now m = 
= 
= 2
End A of the rod acts as an object for mirror and A' will be its image so
|u| = (2f – λ )
= (20 – 5) = 15 cm
By mirror formula
= 
+ 
⇒ 
= 
+ 
⇒ 
= – 
⇒ V = – 30 cm
Now m = 
= 
=2
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