Explanation:

A ray of light passing through a prism undergoes bending or refraction. Refraction is the change in direction of a ray of light as it passes from one medium to another medium with a different refractive index.

Prism:
- A prism is a transparent optical element with flat, polished surfaces that refract light.
- It has two triangular bases and three rectangular faces.
- The shape of the prism causes the light to refract or bend as it passes through.

Refraction in Prism:
- When a ray of light enters a prism, it first undergoes refraction at the first surface of the prism.
- The ray of light bends towards the base of the prism due to the change in the refractive index.
- After refraction, the light continues to travel through the prism and reaches the second surface.
- At the second surface, the light undergoes refraction again, but this time it bends away from the base of the prism.
- The angle of deviation depends on the angle of incidence and the refractive indices of the prism and the surrounding medium.

Number of Times Light Bends:
- When a ray of light passes through a prism, it bends twice.
- The first bending occurs at the entrance surface, where the light bends towards the base of the prism.
- The second bending occurs at the exit surface, where the light bends away from the base of the prism.
- Therefore, a ray of light passing through a prism bends twice.

Conclusion:
- A ray of light passing through a prism bends twice, once at the entrance surface and once at the exit surface.
- This bending or refraction is due to the change in the refractive index of the prism.
- Understanding the refraction of light through a prism is important in the study of optics and the behavior of light.