Question

a concave lens has a focal length of 50 cm. calculate its power..........plz plz plz ans fast nd relevantly.........​

Answer 1

Answer:

power is equal to 1/f

then f is equal to .5 metres

so power is equal to 1/.5

which is equal to 2metres

Answer 2

Answer:

Power of a lens is always reciprocal to the focal length. So, a convex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D. Since, a convex lens is a converging lens, the power of the convex lens is +2D.

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