Ronit uses a lens of focal length +40 cm and his brother Shobhit uses a lens of focal length -40 cm. What is the nature of the lens and its power used by each of them?
Solution,
A positive focal length of a lens means the lens is converging in nature while a negative focal length means the lens is diverging in nature.
So, Ronit's lens is converging in nature and must be a convex lens while Shobhit's lens must be diverging in nature and must be a concave lens.
Power of a lens is defined as:
A positive focal length of a lens means the lens is converging in nature while a negative focal length means the lens is diverging in nature.
So, Ronit's lens is converging in nature and must be a convex lens while Shobhit's lens must be diverging in nature and must be a concave lens.
Power of a lens is defined as: