The drawing shows four different situations in which a light...

The drawing shows four different situations in which a light ray is traveling from one medium into another. In some of the cases, the refraction is not shown correctly. For cases $(a),(b)$, and $(c)$, the angle of incidence is $55^{\circ}$; for case $(d)$, the angle of incidence is $0^{\circ}$.

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Key Concepts

Refraction

Refraction is the bending of light as it passes from one medium into another due to a change in its speed. This change in speed causes the light ray to change direction at the boundary between the two media.

Snell's Law

Snell's Law quantitatively relates the angles of incidence and refraction to the refractive indices of the two media. It is expressed by the equation n?sin?? = n?sin??, where n? and n? are the refractive indices, and ?? and ?? are the angles with respect to the normal.

Angle of Incidence

The angle of incidence is the angle between the incoming light ray and the normal—a line perpendicular to the surface at the point of incidence. This angle is crucial in determining how much the light ray will bend during refraction.

Angle of Refraction

The angle of refraction is the angle between the refracted light ray and the normal on the other side of the boundary. Its value is determined by Snell’s Law and indicates the degree to which the light ray bends as it enters the new medium.

Normal Line

The normal line is an imaginary line drawn perpendicular to the surface at the point where the light ray strikes. It serves as the reference for measuring both the angle of incidence and the angle of refraction.

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