Laws of Reflection

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Laws of Reflection 2018-03-28T07:46:50+00:00

Say it’s a hot summer day during which we decide to take a cool dip into the pool, the moment we enter the water we feel different in this whole new world of refreshment, in another word we feel a change. This change is also felt when we get out of the pool, so what causes this change. It is the change in our immediate surrounding or environment also called a medium. So, while we were in the pool the medium wherein is water and as soon as we get out of the pool it is replaced with another medium, Air. Just like how this exchange brought about in us when we are in and out of the pool, light may undergo certain changes when exposed to different media. Let say light passes through any random medium like Air for instance, for ease of explanation we’ll imagine here after the light to be represented in the form of a ray like this

As light always travels in a straight line the Ray represents the straight path of light. The arrowhead represents the direction in which light travels. Likewise, a collection of many Ray’s is called beams, so now when the light encounters any other types of medium like glass for instance then depending upon the type of glass it undergoes few changes in its otherwise straight behavior.

Leaving all other types of behavior to be dealt with in our upcoming sessions, we will only concern ourselves with the bouncing back behavior of light, the behavior called reflection. So, when light passing through any medium bounces of any surface or object back into the same medium the behavior is called reflection. The surface at which reflection takes place is called a reflecting surface. Don’t we usually associate the term reflection when we use mirror for personal grooming and more so often to admire ourselves. We usually see reflection on smooth and lustrous metal surfaces too but what if we told you that objects other than this two are reflecting surfaces in a way? The images we see before us are not smooth or shiny then how are they reflective surfaces? How is the phenomenon of reflection the same but it’s quality different and difficult to understand? let’s quickly learn reflection in detail by taking the example of the mirrors which carry your reflection in the best possible way. Among mirrors the most common types of mirrors that lies in our bathrooms, bedrooms, halls etc it’s called a plan mirror because it has a flat shape. Mirrors are made up of materials like glass or acrylic with a thin layer of silver or mercury coated onto the back this coating the material is in fact the surface on which we actually see our own reflection. This process includes light following certain rules, let’s get to know about them.

Laws of Reflection

Suppose there is a ray incident at some point in the mirror as it is incoming or incident on to the mirror this Ray is called the incident Ray. The point or spot at which the incident ray strikes the mirrors is called the point of incidence. It is at this point that the incident ray bounces off the mirror surface and now is called the reflected ray. It is this ray that meet our eyes and which we interpret as an image but that’s not all let’s now imagine a perpendicular line to be formed at the point of incidence the normal.  The angle that the incident ray forms to the normal are called the angle of incidence and that form by the reflected ray with the normal the angle of reflection. It is to be noted that the normal has to be drawn for the angle to form there are just two rules of reflection which we must keep in mind
  1. The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane. This means that it is not possible for the incident ray to be in one place and the reflected ray to be in another because it would lead to error in the formation of angles when the normal is drawn.
  2. The angle of incidence is always under in any circumstances is equal to the angle of reflection.
So, let’s understand this by selecting a few random angles of incidence. If a beam of light comes at an angle of 60-degree light will get reflected at an angle of 60 degrees. If light makes a zero-degree angle with the normal that is it travels along the normal or parallel to it, the light will be reflected too in the same angle, us giving rise to the parallel beam of lights when there is more than one beam. These rule or properties of light are always true and also are universally accepted, hence they are called

Laws of reflection

. So, the next time you see the plane mirror and your own reflection in it, remember it is because of light that simply follows these laws.

Concave Mirror
But we all have seen other types of mirrors too which are not necessarily flat or plane right. The mirrors in the headlight of the car which helps the light to be focused better, allowing the driver to navigate with ease. These types of mirrors are also used by dentists to focus light on those dark and tricky areas of our mouth. The mirror we are referring to is called a concave mirror. The concave mirror is nothing but a plane mirror with an inward curve. Unlike plane mirrors when light rays are incident onto concave mirrors they tend to converge at a point and for this reason are also called converging mirrors, so naturally, the beam of light this mirror produces is called a converging beam. This property of the mirror causes light to be focused or concentrated at a point thereby amplifying its intensity which gives it magnifying and focusing capabilities.
Convex Mirror
Exactly opposite to concave mirror in terms of both name and function is another type of mirror. It is used as rear view or side view car mirrors, parking of corner mirrors and street lamps to spread light across wider areas these are convex mirrors. A convex mirror is a plane mirror with an outward curve, convex mirrors are called diverging mirrors because when the beam of lights falls on it the rays do not come together as the shape of the mirror causes them to spread across wider angle. Now if these various points of reflections of each light ray are extended to a single point behind the mirror then it looks like these rays of lights are diverging from a point giving rise to divergent beams hence the name convex. This divergent ability of the mirror gives the viewer of either angle or sort of panoramic view of the surrounding.
These two types of mirrors come under the category of spherical mirrors, they are called spherical because they are curved and form a part of the spherical reflecting surface. But whether its plane or spherical mirrors can you notice anything in particular about the rays of light after reflection, like for instance the discipline or the order they follow. Well in the case of a plane mirror of metal plates the light remains parallel even after reflection and even if it is not parallel it sort of follows a sort of orderly fashion of reflection called specular reflection.
In this blog, we understood what reflection is and what reflecting surfaces are. We learned the

laws of reflection

and understood the basics of how it occurs in both plane and spherical mirrors. We looked at the two types of reflection specular and diffused. With Piruby’s elaborative visuals, understanding distinctive trials and speculations have now turned into a bit of cake, Imagine the thoughts through accounts, Organize the thoughts on a mindmap and after that assess by taking a short test to expert any thought. Get information on judicious applications, home trials, activities and authentic to create your future. PiRuby’s monster library does not simply give you through the preamble to the unmistakable subject yet, moreover, empower you to screen the chronicled background of your chase and learned topics down the future reference. Abusing such methodologies offered by PiRuby can help accomplish the desired outcome as one can without a doubt misuse the interleaved chip away at changing beginning with one subject then onto the following.

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