conduct on experiment to find the relation between angle of incidence and angle of refraction when the light rays from denser to rarer madium?
Answers
Take a metal disk .Use a protractor and mark angles along its edges .
Arrange two straws at the centre of the disk in such a way thag they can be rotated freely about the centre of the disk .
Adjust one of the straws to make an angle 10° .
immerse half of the disc vertically into the water,filled in a transparent vessel .
While dipping, verify that the straw at 10° is inside the water .
From the top of the vessel try to view the straw which is inside the water.
Then adjust the other straw which is outside the water until both straws appear to be in a straight line.
Then take the disc oit of the water and observe the two straws on it .
observation : we will find that they are not in a straight line.
We will observe that in the above activity 'r' is greater than 'i' which means light. travels from water (denser ) to air ( rarer ) .it behaves in an opposite way to that we observed
CONCLUSION : when the light ray travels from denser to rarer medium , it bends away from the normal and r > i.
hope this helps you ..