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?

Asked by Rohith Kumar | 4th Mar, 2015, 02:54: PM

Expert Answer:

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.

Answered by Romal Bhansali | 4th Mar, 2015, 07:27: PM

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