The speed of light in a medium of refractive index $1.25$ is . . . . . . .
(Speed of light in vacuum is $3 \times 10^{8} \,m \,s^{-1}$)
(Speed of light in vacuum is $3 \times 10^{8} \,m \,s^{-1}$)
- A$2.4 \times 10^{8} \,m \,s^{-1}$
- B$1.5 \times 10^{8} \,m \,s^{-1}$
- C$2.0 \times 10^{8} \,m \,s^{-1}$
- D$1.25 \times 10^{8} \,m \,s^{-1}$
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