What is light – Laws of Reflection

What is light - Laws of Reflection

LIGHT : REFLECTION, DISPERSION, LATERAL INVERSION & HUMAN EYE

Light is a very important topic not only for CBSE Class 10 but also in every aspect as we are able to see this beauty with help of our eyes. It is a fact that we can’t see anything without the light, that is, in the dimness. When light falls on or is radiated by an object our eyes distinguish that light and consequently the item gets visible to us. Let’s dive in to understand the concept of Light and its related phenomenon.
Table of Content:
1. What is light?
2. Dispersion of Light
3. Reflection of Light
4. Laws of Reflection
5. Lateral Inversion
6. Human Eye

WHAT IS LIGHT?

Light is a type of energy which is accountable for the feeling of sight in the natural eyes. Light can be called as radiation that is discharged, reflected, or consumed by various items.
We are able to see this beauty with help of our eyes. It is a fact that we can’t see anything without the light, that is, in the dimness. When light falls on or is radiated by an object our eyes distinguish that light and consequently the item gets visible to us. A mirror is a material made from glass having a shiny surface. Due to its shiny surface, when light falls on a mirror it is reflected back. Subsequently, a mirror alters the course of light that falls upon it.

DISPERSION OF LIGHT

The sun is the greatest source of light on earth. The daylight is white but this white light frequently scatters into a few colours which bring about various shades of the sky at various times.
The white light comprises seven hues to be specific VIBGYOR (violet, indigo, blue, green, yellow, orange, and red). This creation of seven shades of white light is called Spectrum. This marvel of the parting of light into its constituents is called Dispersion of light.

 

Examples of Dispersion of light:

1. Development of rainbow because of the scattering of white light through the water beads.

2. Passing of Sunlight through a crystal

3. Scattering of light through the water Bubbles

4. Scattering of light on the CDs

 

REFLECTION OF LIGHT

Reflection of light is the phenomenon of bouncing back of light in the same medium on striking the surface of any object. Or in other words, when light strikes a surface and bounces back, this phenomenon is called reflection.

 

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LAWS OF REFLECTION

When light strikes a surface and bounces back, this phenomenon is called reflection. There are some laws which is followed by the Reflection of Light. Before understanding the Laws of Reflection, let’s understand some important terms;

  • Incident Ray – The beam of light that falls on a surface is called an incident ray. For each incident ray, there is one and only one reflected ray.
  • Reflected Ray – The ray of the light that gets reflected back from the surface is called a reflected beam.
  • Normal Ray – It is an imaginary line that is drawn upright to the reflecting surface at the point where the incident ray strikes on the surface.
  • Angle of Incidence – It is the angle that the incident ray makes with the normal.
  • Angle of Reflection – It is the angle that the reflected ray makes with the normal.

 

FIRST LAW OF REFLECTION

The angle of incidence and the angle of reflection are equal in magnitude. The angle by which a beam of light is incident on a surface will consistently be equivalent to the angle by which it is reflected back from the surface.

SECOND LAW OF REFLECTION

The incident ray, the reflected ray, and normal all lie in a similar plane.

 

WHAT IS LATERAL INVERSION?

When an image is formed in a mirror, the left half of the object shows up at the right side of the picture and the other way around. This is known as lateral inversion.

Class 10 science , light

Now, it’s time to understand the difference between Regular and Diffused Reflection;
Regular and Diffused reflection

REGULAR REFLECTION DIFFUSED REFLECTION

Class 10 science , light

Now, let’s focus on the most important organ because of which we can see this beautiful world, let’s dive in to Understand Human Eye Structure and Function;

 

HUMAN EYE – STRUCTURE, AND FUNCTION

Eyes are organs that permit us to see things present in the earth. The eyes retain the light beams and structure a visual picture and change this data of the picture to the cerebrum.
The eye has a circular structure which is known as the eyeballs. The eyeballs are joined in the eye attachment and different muscles are associated with them called the eye muscles. These are muscles permit the development of the eyeballs.

The eyes are protected with eyelids. They forestall an abundance of light and waste particles to enter into the eyes and also protect the eyes from any external items.

Parts of the Human Eye

Cornea – It is a straightforward covering present on the external side of the eyes. It comprises of 6 layers. Tear liquid spreads cornea and ensures the eye.

Iris – It is a dim hued strong structure present in the focal point of the cornea. The Iris comprises of a little opening consider Pupil through which the light goes into the eye. The measure of light that enters the eye is constrained by the Iris.

Focal point – It resembles a circle of fluid present inside the eye. The eye focal point is situated behind the Pupil which helps in the development of a picture in the eye.

Retina – Retina is a layer situated behind the focal point at the rear of the eye. The eye focal point centres the light that goes into the eye over the retina. The retina comprises of various Nerve cells that perform various errands. There are tactile cells that recognize the light. They at that point change that data into an electrical drive. These electrical driving forces are sent to the mind through the optic nerve. Two sorts of vision cells in the retina are:

a) Poles – They get initiated in dimness or diminish light and the liable for light-dim vision.

b)Cones -They respond to brilliant light and accordingly sense shading in an article.

Vitreous Chamber – The internal space of the eyeball is called the vitreous chamber. It comprises of a gel-like substance. This substance keeps up the correct weight in the eye and keeps up the soundness of the eyeball.

Blind Spot – There is a point in the eye situated at the intersection of the retina and the optic nerve where no tangible cells are available.

 

Browse the class 10 online science classes video lectures and learn.

How to take care of our eyes?

1. One ought to go for a customary eye check-up.

2. Wear spectacles if the visual perception is discovered frail.

3. Continuously study or sit in front of the TV inadequate light. Abundance or lacking light both can prompt issues. Inadequate light can make strain and leads a cerebral pain.

4. Try not to take a look at the sharp source of light like the sun legitimately. An overabundance of light can harm the eyes.

5. In the event that residue goes into the eye, one should not rub them and rather wash them.

6. Keep up a typical separation while sitting in front of the TV.

7. Take a decent eating routine to guarantee that you get the correct supplements.

 

Click below to learn other topics of science for Online class 10:
What are Magnetic Effects of Electric Current?
What is Electromagnet? Magnetic Effect of Current

 

 

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