Question

An experiment to trace the path of a ray of light through a glass slab was performed by four students A , B , C and D. They reported the following measurement of angle of incident i, angle of refraction r and angle of emergence e. Which one of the students has performed the experiment correctly? 

Student A : i=30° , r=25° , e=29°

Student B : i=35° , r=40° , e=35°

Students C : i=45° , r=40° , e=40°

Student D : i=30° , r=25° , e=35°​

Answer 1

Answer:

Correct option is

A

angle of emergence is less than the angle of refraction

C

emergent ray is parallel to the refracted ray

A. We know that angle of incidence is equal to angle of emergence.

And for a light ray going from rarer to denser medium we also know that angle of incidence is greater than angle of refraction

Thus it implies that angle of emergence is greater than angle of refraction.

C. Since angle of emergence is equal to angle of incidence, thus emergent ray is parallel to incident ray.