Question

For a specific glass lens f=0.5 .This is the only Information given to the student. Which type of lens is given to him and what is itspower? a) power 2D ; convex lens b) power 1D ; concave lens c) power -0.5; concave lens d) power -0.25 D ; convex lens

Answer 1

Answer:

Option: (A) = power 2D; convex lens.

Explanation:

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Answer 2

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Option A 2D ; convex lens

Power of lens is reciprocal of its focal length in meters.

If power of a lens is -2D it means that 1/f (in m)

= -2D FYI, since the focal length will be negetive, this will be a concave lens.