Question

name the type pf lens of its power is -20 D .find the focal length of the lens​

Answer 1

Answer:

concave lens

Explanation:

focal length =-5

as power is the reciprocal of focal lenght in meters

Answer 2

Answer:

p= 1/f = f= 1/p = 100/-20=-5 m

Explanation:

and the power of lens is diverge lens