Question

A glass prism of minimum deviation d is put in medium with ri>1. How will dd change?

Answer 1

Answer:

As a ray of light enters any medium, the ray's direction is deflected, based on the entrance angle (typically measured relative to the surface normal), the material's refractive index, and according to Snell's law. A beam passing through an object like a prism or water drop is deflected twice: once entering, and again when exiting. The sum of these two deflections is called the deviation angle.

The deviation angle in a prism depends upon:

Refractive index of the prism: The refractive index depends on the material and the wavelength of the light. The larger the refractive index, the larger the deviation angle.

Angle of the prism: The larger the prism angle, the larger the deviation angle.

Angle of incidence: The angle at which the beam enters the object is called the angle of incidence. The deviation angle first increases with increasing incidence angle, and then decreases.

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