Q. 1 L5.0( 1 Vote )

Which of the lenses with focal length 10cm, 20cm, 25cm and 50cm has maximum power?
A. 50 cm

B. 25 cm

C. 20 cm

D. 10cm

Answer :

Power of lens = .Therefore if focal length is less power is more and if focal length is more power is less.

Option (A): 50 cm is the highest focal length in given options; hence it will have lowest power. Therefore, Option A is incorrect.


Option (B): 25 cm is not the lowest focal length; hence it will not have highest power. Therefore, Option B is incorrect.


Option (C): 20 cm is not the lowest focal length; hence it will not have highest power. Therefore, Option C is incorrect.


Option (D): 10 cm is the lowest focal length in given options. Hence it will have highest power. Therefore, Option D is correct.

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