The refractive indices of four substance P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance:
(a) P (b) Q (c) R (d) S
S Explanation: We know that: Refractive index (n) = Speed of light in air / Speed of light in a medium According to this formula, speed of light will be maximum in a substance whose refractive index is minimum. Therefore, speed of light will be maximum in substance S whose refractive index is 1.31.
Solution The Refractive Indices of Four Substance P, Q, R And S Are 1.50, 1.36, 1.77 and 1.31 Respectively. the Speed of Light is the Maximum in the Substance: (A) P (B) Q (C) R (D) S Concept: Refraction of Light - Refractive Index.