Question

The observations made by Swarali while doing an experiment are given below. Based on these, write answers to the questions.

Swarali found that the light ray travelling from the denser medium to the rarer medium
goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of
refraction (r) went on increasing. However, after certain value of the angle of incidence,
the light ray is seen to return back into the denser medium.

Questions:
a. What is the specific value of angle i called?
b. What is the process of reflection of incident ray into denser medium called?
c. Draw the diagrams of three observations made by Swarali.​

Answer 1

Answer:

1) The specific value of angle i is called Critical angle.

2) The process of reflection of incident ray into denser medium is called Total internal reflection.

3) Answer is in the figure.

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Answer 2

Answer:

the specific value of angle is called critical angle

2=the process of reflection of incidents ray in to denser medium is called total internal reflection