1) What are the materials required for this experiment?
A drawing board, four to six pins, a white sheet of paper, a rectangular glass slab, a protractor, a scale, a pencil, and thumb pins are the materials required for this experiment.
2) What is a ray diagram?
A ray diagram is a pictorial representation of the viable paths light rays can travel from one point to another.
3) What are the sources of errors in this experiment?
The calculations carried out by the protractor should be precise. No air bubbles should be present in the glass slab.
4) What are the few precautions that should be taken while doing this experiment?
- The glass slab should have ideal smooth faces.
- The drawing board must be soft so that all pins can be effortlessly fixed on it. The incidence angle must be between 30° and 60°.
- All pin bases must be in a straight orientation.
- The length between the pins Q and P or the pins S and R must be about 5cm. Use a sharp-pointed pencil to draw thin lines. The protractor’s quality should be optimal. The protractor’s placement should be accurate to get error-free measurements. The perpendicular lines should be represented with care.
5) What is light?
Light is a type of electromagnetic radiation within the section of the electromagnetic spectrum that can be observed by the human eye.
6) What is the refraction of light?
When light propagates from one physical medium to another medium, it (varies its path) and deviates from its normal path, this process is known as the refraction of light.
7) During this light experiment of tracing the path of white light through a glass slab, what is the ideal angle of incidence?
In this experiment, the ideal angle of incidence should be between 30° to 60°.
8) What is meant by lateral displacement?
The perpendicular deviation in the trajectory of the incident ray when it moves from one physical medium to another is known as lateral displacement.
9) How is the angle of emergence and the angle of incidence related?
The angle of emergence and the angle of incidence are typically equal. In some cases, the difference may be around 1°.
10) What is the property behind the formation of a rainbow?
The refraction of light produced by small water droplets in the air causes the rainbow formation in the sky.
11) When a light ray moves from water to oil, what will be the direction in which the light bends?
Oil is much denser than water, so the light ray will surely shift towards normal.
12) When a light ray moves in the trajectory of a normal ray, then what will be the incidence angle?
As the light ray (incident ray) is at zero degrees angle with the normal, so the incidence angle is zero degrees.
13) What is the ideal condition where the incident ray and the emergent ray are parallel?
The incident ray and the emergent ray are parallel when the angle of emergence is equal to the angle of incidence.
14) Why does a light ray shift towards the normal when the ray moves from air to a glass slab?
When light propagates from a rarer medium (here air) to a denser medium (here glass slab), its speed reduces. Therefore, the light ray bends to go through the shortest path.
15) What is the factor that controls a glass slab’s lateral displacement?
The thickness of the slab controls the lateral displacement. Lateral displacement increases when the slab’s thickness increases.
16) Why does the preferred angle of incidence lie between 30° and 60°?
In the case of angles below 30° and above 60°, the refracted light may not be visible on the opposite side of the glass slab.
17) Why is the incident ray parallel to the emergent ray following the incident ray’s refraction through the slab?
Because the angle of emergence is equal to the angle of incidence, in fact, they are also alternate interior angles.
18) When a light ray travels through a glass slab, what is the number of path changes?
The light ray bends two times. At the first shift, when it moves from air to the slab, the light changes its direction towards normal. At the next shift, when the light ray travels out from the glass to air, the light moves away from the normal (when light travels from denser to rarer medium).
Also Read:
- Tracing Path of a Ray of Light Passing Through a Glass Slab
- Chapter Wise Physics Class 10 MCQs
- Physics Class 10 Practicals list
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