The observations made by Swarali value doing the experiment are given below. Based on these write answers to the questions : Swarali found that the light ray travelling from the denser medium to a rarer mediumgoes away from the normal. If the mangle of incidence(i) is raised by Swarali, the angle of refraction ( r ) went on increasing,. However, after certiain value of the angle of incidence, the light ray is seen to return backinto the denser medium. (i) What is the specific value of /_ i called ? (ii) What is the process of reflection of incident ray into a denser medium called ? (iii) Draw the diagrams of three observations made by Swarali.

The observations made by Swarali value doing the experiment are given

1.	The observations made by Swarali value doing the experiment are given below. Based on these write answers to the questions : Swarali found that the light ray travelling from the denser medium to a rarer mediumgoes away from the normal. If the mangle of incidence(i) is raised by Swarali, the angle of refraction ( r ) went on increasing,. However, after certiain value of the angle of incidence, the light ray is seen to return backinto the denser medium. (i) What is the specific value of /_ i called ? (ii) What is the process of reflection of incident ray into a denser medium called ? (iii) Draw the diagrams of three observations made by Swarali.
Answer» Solution :(i) CRITICAL angle. (ii) TOTAL internal reflection