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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 March 2015, 2:54 PM
Answered by 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 Expert 4th March 2015, 7:27 PM
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