The drawing board should be soft so that pins can be easily fixed on it.

The rectangular glass slab used should have perfectly smooth faces.

The light will bend towards the normal when it travels from an optically rarer medium to an optically denser medium.

For different angles of incidence, the lateral displacement will remain the same.

As the light is traveling from rarer to denser optical medium, the angle of refraction will be lesser than the angle of incidence.

The angle of incidence and the angle of emergence are almost equal.

Repeat the same procedure for angle 45° and 60°.ĭue to human error the value of ∠i – ∠e may not be equal to zero.

The lateral displacement is obtained by extending the ray PQ in a dotted line which is parallel ray to FRS.

Measure the angles formed at AB and CD, i.e, the incident angle, refracted angle, and emergent angle.

Using a pencil, join the points E and F.

Draw a perpendicular N’M’ to CD at point F.

Join points R and S such that it meets CD at point F.

Draw a small circle around the pins P, Q, R, and S and remove the pins.

To fix R and S, see through the glass slab of side CD, such that when seen through the glass slab, all the pins P, Q, R, and S should lie in a straight line.

Place the glass slab on the rectangular figure ABCD.

Fix pins at P and Q at 4-5 cm on the ray that is obtained by the angle.

Draw one angle of 30° with the help of protractor with EN.

Mark point E on AB and draw a perpendicular EN and label it as a normal ray.

Let ABCD be the rectangular figure obtained by drawing.

Using a sharp pencil, draw the outline boundary of the glass slab, place it at the white paper.

Fix a white sheet on the soft drawing board using thumb pins.

Lateral displacement is defined as the perpendicular shift in the path of light when it emerges out from the refracting medium. The refraction of light is a property of light in which the light changes its path when it passes from one medium to the other.

Snell’s law: The law states that the ratio of the sine of an angle of incidence to the sine of the angle of refraction is constant.

The incident ray, the normal ray, and the refracted ray, all lie in the same plane.

Measure the angle of incidence, angle of refraction, angle of emergence, and interpret the result. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. To trace the path of a ray of light passing through a rectangular glass slab?

Rectangular glass slab experiment