1 An equi convex lens of focal length 10 cm at t 0 and

Last updated: 6/9/2023

1 An equi convex lens of focal length 10 cm at t 0 and refractive index u 1 5 is placed in a liquid whose refractive index varies with time as t 1 1 0 t If the lens was placed in the liquid at t 0 10 after what time in sec lens will act as concave lens of focal length 20 cm ANSWER