Two small angled prisms A and B deviate the blue rays by `6^(@)` and `8^(@)` and the red rays by `4^(@)` and `6^(@)` respectively. Which prism has a greater dispersive power ?

Explanation

To determine which prism has a greater dispersive power, we will follow these steps:

### Step 1: Understand the concept of dispersive power
Dispersive power (ω) of a prism is defined as the ratio of angular dispersion (the difference in deviation for two colors) to the mean deviation (the average deviation for the two colors).

### Step 2: Calculate angular dispersion for prism A
For prism A:
- Deviation for blue rays = 6°
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