Question

If a power of lens is 2.5d name the lens and its focal length

Answer 1

its focal length is P=1/F

F=1/P

F=1/2.5

F=100/25

F=4

Answer 2

Answer :-

• Power of lens is 2.5D

To Find :-

• Focal length

Answer :-

• F = 1/D

=> F = 1/2.5

=> F = 0.4m