Question

A student traces the path of a ray through a glass prism for four different values of angle of incidence. On analysing the diagrams he is likely to conclude that the emergent ray (A) is always parallel to the incident ray (B) is always perpendicular to the incident ray (C) is always parallel to the refracted ray (D) always bends at an angle to the direction of incident ray

Answer 1

Answer:

Option A

Emergent ray is always parallel to the incident ray

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Answer 2

A student traces the path of a ray through a glass prism for four different values of angle of incidence.  (D) always bends at an angle to the direction of incident ray.

Explanation:

• The incident ray is a light ray that strikes the surface.
• The angle of incidence between this ray and the perpendicular or natural surface is the angle of incidence.
• It is refracted against the usual as an incident ray of light passes a prism.
• This refracted ray then strikes the other side of the prism and deviates away from the usual and leaves the glass prism to enter the air from one medium to the other.
• This ray that leaves the prism is called an emerging ray.
• Prism is a triangular glass which has two triangular bases and three rectangular lateral surfaces.
• The unique shape of the prism makes the emergent ray bend at an angle to the direction of the incident ray and this angle is known as the angle of deviation.