Question

in an experiment with a rectangular glass slab a student observed the tree of light incident at an angle of 60 degree with the normal on one face of the slab after refraction stripes the opposite face of the slab before working out into the air making an angle of 42 degree with the normal draw a labelled diagram to show the path of this Re what value would you sign into the angle of refraction and the angle of emergence​

Answer 1

Answer:

Materials Required

A drawing board

4-6 all pins

White sheet of paper

Rectangular glass slab

A protractor

A scale

A pencil

Thumb pins

Procedure

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

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

Let ABCD be the rectangular figure obtained by drawing.

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

We Draw one angle of 30° with the help of protractor with EN. Fix pins at P and Q at 4-5 cm on the ray that is obtained by the angle.

Place the glass slab on the rectangular figure ABCD.

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.

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

Remove the glass slab.

Join points R and S such that it meets CD at point F. Draw a perpendicular N’M’ to CD at point F.

Using a pencil, join the points E and F.

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

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

Measure the lateral displacement.

Repeat the same procedure for angle 42° and 60°.