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9. please help Light travelling in medium X strikes a surface and refracts into air. The angle of incidence is 220 and the angle of

9. please help

Light travelling in medium X strikes a surface and refracts into air. The angle of incidence is 220 and the angle of refraction is 53. The speed of light in medium X is 0 2.6 x 108 m/s 0 6.4 x 108 m/s 0 1.2 x 108 m/s 1.4 x 108 m/s

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