Name any two characteristics of light which do not change on polarisation

Explanation

To answer the question, "Name any two characteristics of light which do not change on polarisation," we can follow these steps:

### Step 1: Understand Polarisation
Polarisation of light refers to the process in which the vibrations of light waves are restricted to a particular direction. This means that while the light may be unpolarised initially, it can be made to vibrate in a single plane when it passes through a polarising filter or material.

### Step 2: Identify Characteristics of Light
When light is polarised, certain characteristics remain unchanged. The two main characteristics of light that do not change upon polarisation are:

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