which material used for determination of ray tracking by a glass slab?
Answers
Answer:
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Explanation:
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When a ray of light travels through a glass slab from air, it bends towards the normal and when it comes out of the other side of the glass slab, it bends away from the normal. It is found that the incident ray and the emergent ray are not along the same straight line, but the emergent ray seems to be displaced with respect to the incident ray. This shift in the emergent ray with respect to the incident ray is called lateral shift or lateral displacement. The incident and the emergent rays, however, remain parallel.
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Answer:
Refraction is the property of light in which it bends from one medium to another. The law of refraction is also known as Snell’s law which states that the ratio of the sine of the angle of incidence to the angle of refraction is equal to constant. Below is an experiment to trace the path of a light ray passing through the rectangular glass slab.
Aim
To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result.
Theory
What are laws of refraction?
Following are the laws of refraction:
The incident ray, the normal ray and the refracted ray, all lie in the same plane.
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.
sinisinr=consatnt
What is refraction of light?
Refraction of light is a property of light in which the light changes its path when it passes from one medium to the other.
What is lateral displacement?
Lateral displacement is defined as the perpendicular shift in the path of light when it emerges out from the refracting medium.
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.
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 45° and 60°.