question_answer

In which of the following case of spherical lenses (as shown in figure), the emergent ray is parallel to incident ray?

A)                   

B)   

C)                 

D)  

Correct Answer: D

Solution :

In this part the radii of curvature of two faces (convex and concave) of a lens are equal, i.e.,\[{{R}_{1}}={{R}_{2}}\] So, the incident and emergent rays will be parallel.