Question

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and same material such that P, Q, and R are now combined as shown in figure. The ray will now suffer

• A. greater deviation
• B. same deviation as before
• C. total internal reflection
• D. no deviation

Hint:

The total deviation increases with the addition of more prisms, as it alters the path of the light further.

Answer 1

The Correct Option is A

Step 1: Understanding the deviation.
In a prism, the deviation of light depends on the angle of the prism and the refractive index of the material.

Step 2: Adding additional prisms.
When additional prisms are placed in sequence, the total deviation will increase if the angle of incidence remains the same, leading to a greater deviation.

Step 3: Conclusion.
Thus, the ray will now suffer a greater deviation.