Question

calculate the power of convex lens whose facal length is 2m​

Answer 1

Explanation:

The power of the lens D = 1/f

Focal length of convex lens = 2m

D = 1/2

So, the power of convex lens = 0.5m

Answer 2

Answer:

power of convex lens = -0.5 dioptre

Explanation:

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in metres, or P= f/1

, where P is the power in dioptres and f is the focal length in metres.

The power of the lens, P= 1/f

Focal length of concave lens, f=−2m

P= 1/-2

Then,

the power of the lens, P= −0.5 dioptre