science
Grade-7
Easy
Question
A ray of light is incident on an air-glass interface at an angle of 25 degrees. The angle of emergence will be ___ degrees.
Hint:
The ray of light is refracted twice.
The correct answer is: 25
A ray of light is incident on an air-glass interface at an angle of 25 degrees. The angle of emergence will be 25 degrees.
The angle of incidence and emergence is always equal for a glass slab. The ray of light first passes through air(rarer medium) to glass (denser medium) and then again from glass (denser medium) to air(rarer medium). This way the ray gets refracted twice and there's a lateral shift. Due to this shift the incident and emergence ray becomes parallel and equal.
Therefore, if the angle is incidence is 25 degrees the angle of emergence will be equal i.e 25 degrees..
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