PhysicsNEET 2023Total internal reflection and prisms

Ray Optics and Optical Instruments

Light travels a distance $x$ in time $t_{1}$ in air and $10 x$ in time $t_{2}$ in another denser medium. What is the critical angle for this medium?

A. $sin^{- 1} (\frac{t _{2}}{t _{1}})$
B. $sin^{- 1} (\frac{10 t _{2}}{t _{1}})$
C. $sin^{- 1} (\frac{t _{1}}{10 t _{2}})$
D. $sin^{- 1} (\frac{10 t _{1}}{t _{2}})$ ✓

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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