UPSSSC PET 2026 (25 Oct Shift 1)
The law of refraction is also known as :
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Answer: Option D — Snell’s law
Detailed Solution
The second law of refraction, constant (the refractive index), is called Snell's law. Brewster's law is about polarisation by reflection.
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Light & Optics — UPSSSC PET Preparation
This question tests your understanding of Light & Optics, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
This topic covers the nature of light, reflection and refraction, mirrors and lenses, total internal reflection, dispersion and scattering of light, the human eye and its defects, optical instruments, and the colours of objects. Exams test the phenomena behind everyday sights: the sky looks blue because of the scattering of light, rainbows form through dispersion and internal reflection, diamonds sparkle because of total internal reflection, and mirages are caused by refraction. Know which lens corrects which defect (concave lenses for myopia and convex lenses for hypermetropia). Practise the light and optics questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.