RRB Group D 20 Sep 2018 Shift 3 Paper

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Question : 16 of 100

Marks: +1, -0

The speed of light in a medium of refractive index 1.5 is ________.

1.2 × 10⁸m/s
1.5 × 108 m/s
3 × 108 m/s
2 × 108 m/s

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