JIPMER2004PhysicsRay Optics
Two thin lenses of powers 12 D and -2 D respectively are placed in contact, the power, focal length and nature respectively will be
Options
- A8 D , 0.8 ~m , convex
- B14 D , 0.5 ~m convex
- C5 D , 0.2 ~m , convex
- D10 D , 0.1 ~m , convex
Correct answer
D. 10 D , 0.1 ~m , convex
Step-by-step solution
Given: P₁=12 D , P₂=-2 D Power of combination P=P₁+P₂=12-2=10 D Focal length f= 1 P = 1 10 ~m =0.1 ~m The combined lens will be convex (convergent)