The drawing shows a rectangular block of glass (n=1.52)...

The drawing shows a rectangular block of glass $(n=1.52)$ surrounded by liquid carbon disulfide $(n=1.63) .$ A ray of light is incident on the glass at point A with a $30.0^{\circ}$ angle of incidence. At what angle of refraction does the ray leave the glass at point $\mathrm{B} ?$

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Key Concepts

Parallel Interfaces

In the context of a rectangular or parallel-sided medium, the interfaces on either side are parallel to each other. This geometric configuration ensures that, although the light ray is bent at each interface according to Snell's law, the emergent ray on exiting the medium has an angle relative to the normal that is the same as the original incident angle, resulting in a parallel exit to the incident path.

Snell's Law

Snell's Law is a fundamental principle in optics that relates the angles of incidence and refraction for a light ray crossing the boundary between two media with different refractive indices. It states that the product of the refractive index and the sine of the angle in one medium is equal to that in the other medium, allowing one to predict the direction change of the light ray upon entering a new material.

Index of Refraction

The index of refraction, often denoted as n, is a measure of how much the speed of light is reduced inside a medium compared to its speed in a vacuum. It determines the degree to which light bends when entering the medium, and differing indices of refraction between materials are responsible for the refraction and overall propagation behavior of light at interfaces.

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