Find the focal length of a lens of power -20 D What type of lens is this?

Power of lens (P) = -2.0 D
P = 1/f or f = 1/m
f = 1/-2.0 = -0.5 m
Negative sign of focal length means that the lens is concave lens.

Related Questions & Answers
Which Of The Following Food Items Is A Rich Source Of Calcium	What Is The Interaction Energy Associated With London Force
Explain Torque With An Example	The Gravitational Unit Of Force Is
Explain The Term Force With Example	During Flight The Weight Of The Plane Is Balanced By
Bryophyllum Can Reproduce By Its	What Is The Role Of The Brain In Reflex Action
Like Sound Light Also Cannot Travel In Vacuum	What Are The Different Units Of Light

Related Questions & Answers

Which Of The Following Food Items Is A Rich Source Of Calcium

What Is The Interaction Energy Associated With London Force

Explain Torque With An Example

The Gravitational Unit Of Force Is

Explain The Term Force With Example

During Flight The Weight Of The Plane Is Balanced By

Bryophyllum Can Reproduce By Its

What Is The Role Of The Brain In Reflex Action

Like Sound Light Also Cannot Travel In Vacuum

What Are The Different Units Of Light

Find the focal length of a lens of power -2.0 D. What type of lens is this?