First slide

Dispersion

Question

An achromatic combination of lenses produces

Moderate

A

Coloured images
B

Highly enlarged image
C

Images in black and white
D

Images unaffected by variation of refractive index with wavelength

Solution

$Since f \propto \frac{1}{μ} \propto λ, so voilet colour is focused nearer to the lens.$

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