COMEDK · Physics · 25. Ray Optics
What is the velocity of light in vacuum if the velocity of light in a medium of refractive index 1.2 is ' v ' \(\mathrm{ms}^{-1}\) ?
- A \(\left(\dfrac{v}{1.2}\right) m s^{-1}\)
- B \((1.2 v) \mathrm{ms}^{-1}\)
- C \(3 \times 10^8 m s^{-1}\)
- D \((2.4 v) \mathrm{ms}^{-1}\)
Answer & Solution
Correct Answer
(B) \((1.2 v) \mathrm{ms}^{-1}\)
Step-by-step Solution
Detailed explanation
The refractive index \(\mu\) of a medium is defined as the ratio of the speed of light in vacuum (\(c\)) to the speed of light in the medium (\(v\)). \(\mu = \dfrac{c}{v}\) Given that \(\mu = 1.2\) and the velocity in the medium is \(v\), we have: \(1.2 = \dfrac{c}{v}\) Solving…
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