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Physics Guru is an online education and competitive examinations preparation portal founded by Manish Verma, an IIT Madras alumnus, providing learning resources for competitive examinations.

The emphasis is on conceptual understanding, analytical thinking and problem solving rather than simply memorising formulas and standard methods.

The objective is to help students understand what they are learning and develop the ability to solve problems they have not seen before.

Hollow Prism Q and A

Question (one option correct type):

A beam of light passes through a hollow glass prism. Then,


A) the beam of light undergoes lesser but some dispersion compared to solid glass prism
B) the beam of light is totally internally reflected and does not come out through the opposite face
C) the beam of light does not undergo dispersion at all and comes out parallel to the incident ray
D) the beam of light undergoes angular deviation

Solution


When a ray enters glass slab from air and again goes away from the glass slab, the emerging ray is parallel to the incident ray. This means that ray 2 is parallel to ray 1. Further, ray 3 is parallel to ray 2. This means that ray 1 is parallel to ray 3.

Answer: C.