The focal length of a spherical mirror made of steel is 150 
. If the temperature of the mirror increases by 
, its focal length become (coefficient of linear expansion of steel 
.)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given, focal length of spherical mirror, 
Coefficient of linear expansion of steel,
As temperature changes by 
Radius 
changes by 
we can define coefficient of linear exapnsion,
As 
where, 
focal length of the mirror at temperature 
and 
final focal length of mirror at 
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