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Question

The law of refraction is also known as :

This question was previously asked in
UPSSSC PET 2026 Question Paper (25-Oct-2026) (Shift-2)
The correct answer is

Snell’s law

The second law of refraction states that, for a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant: \( \frac{\sin i}{\sin r} = \text{constant} \).

This relation, \( n_{1} \sin i = n_{2} \sin r \), was stated by Willebrord Snell and is therefore called Snell’s law.

Brewster’s law deals with polarisation by reflection, while Huygens’ and Fresnel’s work concern the wave theory and diffraction of light.

Hence, Snell’s law.

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