Question

How do you verify experimentally that the angle of refraction is more than angle of incidencewhen light rays travel from denser to rarer medium.

Answer 1

Explanation:

For this we will do following experiment-

1. Take a glass slab pass a ray of light through it observe the light at the boundary of the both of medium from rarer to denser it will bend towards normal forming an angle known as angle of incidence .
2. After all passing through denser medium that will be glass slab it will move away from normal forming an angle known as angle of refraction.
3. Measure both the angles.
4. We will observe that the angle of refraction is more than angle of incidence as it bends away from normal so it is obvious the angle will be complementary while as the first one is supplementary as it bends towards normal.

Answer 2

Answer:

Procedure :

AP SSC 10th Class Physics Solutions Chapter 5 Refraction of Light at Plane Surfaces 9

AP SSC 10th Class Physics Solutions Chapter 5 Refraction of Light at Plane Surfaces 10

Take a metal disc. Use a protractor and mark angles along its edge as shown in the figure.

Arrange two straws at the centre of the disc, in such a way that they can be rotated freely about the centre of the disc.

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° must be inside the water.

From the top of the vessel, try to view the straw which is inside the water as shown in the figure.

Then adjust the other straw which is outside of the water until both straws look like they are in a single straight line.

Then take the disc out of the water and observe the two straws on it. You will find that they are not in a single straight line.

Measure the angle between the normal and second straw. Note the values in the following table.

AP SSC 10th Class Physics Solutions Chapter 5 Refraction of Light at Plane Surfaces 11

Do the same for various angles and find the corresponding angles of refraction and note them in the table.

Observation :

We will find the angle of refraction is more than angle of incidence.

i. e., r > i.

Conclusion :

When light travels from denser (water) to rarer (air) it bends away from the normal.