A convex lens of glass `(mu=1.5)` is formed by combining two surfaces of radii `
Channel: Doubtnut
Date: 26/07/2020

A convex lens of glass `(mu=1.5)` is formed by combining two surfaces of radii `R_(1)=60 cm` and `R_(2)=30cm` . It is cut into two parts in two different ways as shown in Figure .  img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V04_C01_E01_129_Q01.png" width="80%"  Find:  a. the focal length of the lens.  b. in figure (a), the focal length of left portion and that of the right portion.  c. in figure (b), the focal length of the upper part and that of the lower part.