Teaching UP TGT Mock Test Series 2025 Physics Electromagnetic Waves Polarization by Reflection

The refractive index of glass is 1·5. If the speed of light in air is 3 × 10 8 m/s then its speed in glass will be

1
 2 × 10 8 m/s 
2
 3 × 10 8 m/s 
3
 4.5 × 10 8 m/s 
4
 6 × 10 8 m/s 
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