On face of a glass `(mu = 1.50)` lens is coated with a thin film of magnesium fluoride `MgF
Channel: Doubtnut
Date: 12/04/2020

On face of a glass `(mu = 1.50)` lens is coated with a thin film of magnesium fluoride `MgF_(2)(mu = 1.38)` to reduce reflection from the lens surface. Assuming the incident light to be perpendicular to the lens surface. The least coating thickness that eliminates the reflection at the centre of the visible spectrum `(lamda = 550 nm)` is about