What is the speed of light in a medium of refractive index 6/5 if its speed in air is 3×10^8m/s

Question

3 x 1082 x 1081 x 1081.5 x 108

The speed is same as in vacuum.

The correct answer is: 3 x 108

The correct answer is a)3x108m/s.The speed of light in air and vacuum is same. The speed of light in air is 1.0003 times slow and therefore is negligible and is considered same as speed of light in vacuum. The speed of light is more in rarer medium. When light travels from glass (denser medium) the speed is 2x108 m/s. The speed increases in air(rarer medium)

What is the speed of light in a medium of refractive index 6/5 if its speed in air is 3,00,000 km/s?

Medium refractive index = 6/5 = 1.2

In the air, the speed of light is 3,00,000 km/s.

We know that the medium’s refractive index = (light speed in air)/ (speed of light in medium)

(300000)/1.2 = (speed of light in medium)

Light travels at a speed of 2500000 km/s through the medium.

Given:Speed of light in air = 3,00,000 km/sRefractive index of the medium = 6/5Speed of light in the given medium = ?Applying formula for refractive index, we get:Refractive index of a medium = (Speed of light in air) / (Speed of light in medium)or(Speed of light in medium) = (Speed of light in air) / (Refractive index of a medium)= 3,00,000 / (6/5)

= 2,50,000 km/s

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