When light travels from air to medium the angle of incidence is 45 degree and angle of reflection is 30 degree?

Question

3 x 1082 x 1081 x 1081.5 x 108

The speed of light increases when it goes from denser medium to rarer medium.

The correct answer is: 3 x 108

The correct answer is a) 3 x 108 . Light travels faster in air than other mediums which are denser. The speed of light in water is less than that of air as water is denser than air. This is because the molecules of water are closer in water than in air. Light travels the fastest in vacuum then in air and then in other mediums.

Sometimes while applying the Snell's law of refraction, you will receive the sin(Θ₂) as a value greater than 1. This is, of course, impossible - our Snell's law calculator will display the value as "NaN". If this happens, it means that all light is reflected from the boundary (this phenomenon is known as the total internal reflection).

The highest angle of incidence, for which the light is not reflected, is called the critical angle. The refracted ray travels along the boundary between both media. It means that the angle of refraction is equal to 90°. Hence, you can find the critical angle by using the following equation:

After simplification, n₁sin(θ₁) = n₂ * 1.

Solving for the angle of incidence, Θ₁ = arcsin(n₂/n₁).