Question

In an achromatic combination of two prisms
made of materials with dispersive power 0.2
and 0.25, if the angular dispersion produced by
each prism is 10°, the net deviation is
2) 1°
3) 5°
4) 2.5°
1) 10​

Answer 1

Answer:

(1)10

Explanation:

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Answer 2

Answer:

10⁰

Explanation:

Let dispersive powers be ω₁ = 0.2 and ω₂ = 0.25

Angular dispersion, θ₁ = 10⁰ = θ₂

Deviation, δ =

$\delta = \frac{\theta}{\omega}$

Net deviation = δ₁ - δ₂

$\frac{\theta_{1}}{\omega_{1}} -\frac{\theta_{2}}{\omega_{2}} \\\\\frac{10}{0.2} - \frac{10}{0.25}$

= 10⁰