Question

When a ray of white light passes through a hollow prism as shown in the figure, then :

• A. There is no dispersion and no angular deviation.
• B. Dispersion but no angular deviation.
• C. Angular deviation but no dispersion.
• D. There is dispersion and angular deviation both.

Answer 1

The correct option is A There is no dispersion and no angular deviation.

As the prism is hollow light will enter and exit the hollow prism as shown in the figure below.


Here, when the white light enters and exits the hollow prism, the hollow part of prism will behave like a glass slab. Effectively there will be no angular deviation or dispersion.

Hence, option $\left(a\right)$ is the correct answer.