A cylindrical parallel beam of light of radius r falls on a

Last updated: 6/25/2023

A cylindrical parallel beam of light of radius r falls on a thin convex lens of focal length 40 cm and then on a concave lens of focal length 10 cm as shown Area illuminated by beam on the screen is 1 3 f 40 cm f 10 cm 9 r 16 r 30 cm 2 4 50 cm 2 r 4 3 r 16 Screen