Question
Wed March 04, 2015 By: Rohith Kumar

the focal length of convex lens and mirror is taken as +ve whereas for conacave mirror and lens it is taken -ve. is it true?

Expert Reply
Romal Bhansali
Wed March 04, 2015
No it is not true.
The focal length of convex lens and concave mirror is positive.
The focal length of concave lens and convex mirror is negative.
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