2 A point light source is located at a distance L from a

Last updated: 6/14/2023

2 A point light source is located at a distance L from a screen A thin converging lens of focal length f L 4 and aperture radius R held parallel to the screen makes a circular spot of light on the screen If lens is moved from the source towards the screen size of the spot varies Find the radius of the smallest light spot which can be obtained in this way on the screen R 2 FL L