Answer :

The wavelength of red light in glass with an index of refraction of 1.37 is shorter than its wavelength in air. This phenomenon, known as wavelength reduction, occurs because light slows down and changes direction when it enters a medium with a higher refractive index.

When light travels from one medium to another, its speed and direction change due to the different refractive indices of the two materials. The refractive index (n) is a property of a material that determines how much light bends as it passes through it. In this case, red light with a wavelength of 807 nm is initially traveling through air, which has a refractive index of approximately 1. When the light enters glass with a refractive index of 1.37, its speed decreases, and it bends towards the normal (a line perpendicular to the surface of the glass). This bending of light causes a reduction in the wavelength of the light in the glass. According to Snell's law, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the refractive indices of the two media. As a result, the wavelength of the red light in the glass is shorter than in air, although the frequency remains the same. This phenomenon is responsible for the color distortion observed when light passes through a prism or a glass lens.

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