Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ - decoded step-by-step.
Solve it the standard way once - then learn the shortcut.
Q · Optics-Refraction of LightMedium · 45s
If the refractive index of diamond is 2.42, what is the speed of light inside diamond? (Speed of light in vacuum = 3 × 10⁸ m/s)
TopicOptics-Refraction of Light
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
v = c/μ = (3 × 10⁸) / 2.42 ≈ 1.24 × 10⁸ m/s.
Final Answer: Option A - 1.24 × 10⁸ m/s