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Q.

Is it true that as per the New Cartesian Sign Convention, the focal length of a concave mirror, as well as a concave lens, is taken to be negative?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
The focal length of a concave lens and mirror is negative as per New Cartesian Sign Convention. The focal length of a convex lens and convex mirror is positive as per New Cartesian Sign Convention. All distances are measured from the optical centre for a lens and from the pole for a mirror.
 
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