An object is at distance 
and image formed by a mirror on the same side at a distance 
, then focal length is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Focal length is given by
So,
To get the error in focal length, differentiate Eq. (i)
Cancelling negative signs and approximating differential change with small 
change, we get
Hence, focal length is 
taking only magnitude.
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