Question

Name the type of the lens if its power is 2.0d
Find the focal length of this

Answer 1

Answer:

P=1/f( in meters)

so

2=1/f

f=1/2m

f=0.5m

since the p is positive so the lens is convex lens

Answer 2

Answer:

the type of lens is concave lens

formula to find doipture is p=1/f

-2.0 = 1/f

f = -1/2

f = -1/2 = -0.5units