Case : Read the passage and answer the question(s).

A tourmaline crystal is placed such that its crystallographic axis AB is parallel to y-axis. Sunlight is made to pass through it. After the emergence of light from the tourmaline crystal, certain properties of the light are affected.

Which of the following can be plane of vibrations?

1. xy-plane
2. yz-plane

both 1 and 2

The plane that contains the vibrations is called plane of vibration.