An achromatic combination is made by combining 2 prisms as shown. If ω1

Engineering

Physics

Dispersion

Question

An achromatic combination is made by combining 2 prisms as shown. If ω₁ > ω₂, then

Average deviation would be zero

Average deviation would be clockwise

Cannot be predicted on basis of given information

Average deviation would be anticlockwise

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θ₁ + θ₂ = 0

ω₁δ₁ + ω₂δ₂ = 0

$δ_{2} = \frac{- ω_{1} δ_{1}}{ω_{2}}$

δ = $δ_{1} + δ_{2} = δ_{1} (1 - \frac{ω_{1}}{ω_{2}}) = - ve$ ⇒ acω

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