White light is passed through a prism of angle `4^(@)`. If the refractive indices for red and blue colours are 1.641 are 1.659 respectively, then calculate the angle of deviation between them, also calculate the dispersive power.

Explanation

To solve the problem step by step, we will calculate the angle of deviation between red and blue light as well as the dispersive power of the prism.

### Step 1: Calculate the Refractive Index of Yellow Light
The refractive index of yellow light (µy) can be approximated as the average of the refractive indices of red (µr) and blue (µb) light.

Given:
- µr = 1.641 (for red)
- µb = 1.659 (for blue)
...