Q.

Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab :

1 a  
2 b  
3 c  
4 d  

Ans.

(2)

To achieve best experimental set-up for tracing the path of a ray of light through a glass slab, the point of incidence should be in the middle of the glass slab and the incident angle should be close to 45°.