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प्रश्न
The speed of light in vacuum is approximately:
विकल्प
\[3 \times 10^6 \ \text{m/s}\]
\[3 \times 10^8 \ \text{m/s}\]
\[3 \times 10^8 \ \text{km/s}\]
\[1.5 \times 10^8 \ \text{m/s}\]
MCQ
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उत्तर
Light travels in vacuum at \[c \approx 3 \times 10^8 \ \text{m/s}\]. This constant is used together with the refractive index relation \[n = \frac{c}{v}\] to determine the speed of light inside any material medium.
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