Question

If a ray of light passes from a denser medium to a rarer medium in a straight line the angle of incidence must be ___

Answer 1

Answer:

2) If a ray of light passes from a denser medium to a rarer

medium in a straight line, the angle of incidence must be 0 degree

Answer 2

If a ray of light passes from a denser medium to a rarer medium in a straight line, the angle of incidence must be less than the angle of refraction.

This is known as Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the indices of refraction of the two media.

Mathematically, Snell's law can be expressed as:

n1 sinθ1 = n2 sinθ2

where n1 and n2 are the indices of refraction of the two media, θ1 is the angle of incidence, and θ2 is the angle of refraction.

Since the index of refraction of a denser medium is greater than that of a rarer medium, the angle of refraction will always be greater than the angle of incidence, which means the ray of light will bend away from the normal as it passes from the denser medium to the rarer medium. If the angle of incidence is equal to or greater than the critical angle, then the light will be totally reflected back into the denser medium, resulting in total internal reflection.

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