Question

name of experiment used to find the refractive index of prism write the material required and procedure of the experiment​

Answer 1

Answer:

Aim : Finding the refractive index of the prism.

Material required : Prism, piece of white chart of size 20 x 20 cm, pencil, pins,

scale and protractor.

Procedure :

Take a prism and place it on the white chart in such a way that the triangular base of the prism is on the chart.

Draw a line around the prism using a pencil. Remove the prism.

It is a triangle. Name its vertices P, Q and R.

Find the angle between PQ and PR. This is the angle of the prism (A).

Mark M on the side of triangle PQ and also draw a perpendicular to the PQ at M.

Place the centre of the protractor at M and along the normal mark an angle of 30° and then draw line up to M.

This angle is angle of incidence and note it in a table.

Place the prism in its position again.

Now fix two pins vertically on the line at point A and B.

Look for the images of pins through the prism from the other side and fix another two pins at points C and D in such a way that all the four pins appear to lie along same straight line.

Now remove the prism and take out pins.

Draw a line joining the two pin-holes formed by the pins to meet surface PR.

The angle between the normal at N and the emergent ray is the angle of emergence.



Join M and N. A, B, M, N, C, D represent the path of light.

Extend both incident, emergent rays tell they meet at a point ‘O’.

The angle between these two rays is angle of deviation denoted by ‘D’.

Do the same for various angles of incidence such as 40°, 50° etc.

If we take angle of incidence along x-axis and the angle of deviation along y-axis we get the graph as shown in figure.

The refractive index of prism n = sin[(A + D)/2]/sin A/2

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Answer 2

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Aim : Finding the refractive index of the prism.

Material required : Prism, piece of white chart of size 20 x 20 cm, pencil, pins,

scale and protractor.

Procedure :

1. Take a prism and place it on the white chart in such a way that the triangular base of the prism is on the chart.
2. Draw a line around the prism using a pencil. Remove the prism.
3. It is a triangle. Name its vertices P, Q and R.
4. Find the angle between PQ and PR. This is the angle of the prism (A).
5. Mark M on the side of triangle PQ and also draw a perpendicular to the PQ at M.
6. Place the centre of the protractor at M and along the normal mark an angle of 30° and then draw line up to M.
7. This angle is angle of incidence and note it in a table.
8. Place the prism in its position again.
9. Now fix two pins vertically on the line at point A and B.
10. Look for the images of pins through the prism from the other side and fix another two pins at points C and D in such a way that all the four pins appear to lie along same straight line.
11. Now remove the prism and take out pins.
12. Draw a line joining the two pin-holes formed by the pins to meet surface PR.
13. The angle between the normal at N and the emergent ray is the angle of emergence.
14. Join M and N. A, B, M, N, C, D represent the path of light.
15. Extend both incident, emergent rays tell they meet at a point ‘O’.
16. The angle between these two rays is angle of deviation denoted by ‘D’.
17. Do the same for various angles of incidence such as 40°, 50° etc.
18. If we take angle of incidence along x-axis and the angle of deviation along y-axis we get the graph as shown in figure.
19. The refractive index of prism n = sin[(A + D)/2]/sin A/2

RESULTS:

Thus, the mean refractive index of the material = 1.504

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