[Physics Class Notes] on Laws of Reflection Pdf for Exam

You can see the rainbow in the sky when the sun sparkles, yet you can’t see anything in obscurity. The whole credit goes to your eyes that empower you to see the bright rainbow. Did you ask why you can’t see things in obscurity even with your eyes open?  Have you at any point considered the science behind the law of light? It is on the grounds that your eyes can see objects when an article transmits light or mirrors light.

Besides, you regularly go to a mirror or some other sparkly item to get a brief look at your appearance. At whatever point light falls on a mirror, it adjusts the bearing of light. However, what we can see relies on the heading of the light it reflects.

What are the Laws of Reflection of Light?

The skipping back of light beams from the outer layer of an item is called reflection. To get an unmistakable image of the laws of reflection you really want to comprehend various terms of lights, beams, and points.

The terms associated with reflection, light, rainbow, etc are given below- 

• Incident Ray – The beam of light that straightaway falls on the object is known as an incident ray.

• Reflected Ray – The beam of light that is supposed to reflect back after hitting the object or any surface is known as the reflected ray.

• The Angle of Incidence in Law of Light – The angle that is formed between the incident ray and the general at the point of incidence is known as the angle of incidence.

• The angle of reflection in the law of light – When an angle is a result of the reflected ray and the normal ray, it is known as the angle of reflection.

• Normal – Whenever a line makes an angle of 90 degrees, i.e., a straight line angle of the mirror, at any point where the incident ray is supposed to strike the mirror is known as the normal.

Now, let us discuss the laws of reflection in detail:

Law 1 – The primary law of reflection expresses that the reflection point is dependably comparable to the point of incidence.  If the episode beam falls on the plane mirror along with the typical, for example, 90°, the reflected beam will go along a similar way.

Law 2 – The reflected ray, incident ray, point of incidence, and reflection lie on the same surface or on the same plane.

Regular and Diffused Reflection

Under the law of light, there are two types of reflection depending upon its surface – regular and irregular or diffused reflection.

Laws of Light on a Plane Surface

Regular reflection is a condition when light reflects in the same direction from a smooth or plane surface.  Let us understand this with an example.  Suppose an object is placed before the mirror, a smooth surface, the reflecting light of parallel ray will be parallel.  The image on the left of the object appears on the right, and the image on the right appears on the left.  Such reflection is known as lateral inversion.

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Laws of Light on a Rough Surface

Irregular or diffused reflection is a condition when light reflects in an irregular pattern from a rough surface.  Let us understand this with an example.  Suppose light falls upon a wall.  The reflection of parallel rays of light will not be parallel.  The reflecting light spreads in different directions.  Here also the law of reflection of light is working.

 

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Fun Facts on Laws of Light

1. You can see beautiful patterns in a kaleidoscope because of multiple reflections from the mirror placed inside it.

2. The sunlight is a white light that also consists of seven colours of the rainbow which we can see after the rainfall.

3. When you stand before an inclined two mirrors, you can see multiple images of yourself.

4. The moon receives the light from the sun, which makes it illuminate.  Thus, we can see the moon at night.

5. Periscope is an excellent example of reflection from the two mirrors that enables you to see far-away objects.  They are used by soldiers in bunkers at the border.  Furthermore, submarines and tanks also have an inbuilt periscope.