Learning

is

simple

and

fun!

Register now! Browse subjects

### Theory:

Introduction:
• We can see the objects around us through our eyes. However, we cannot see anything around us without light or in darkness.
• When light falls on the object, our eyes detect that light, and hence the object becomes visible to us. Thus light makes things visible.
Candle - Light source

Depending on the interaction of light with materials, the objects can be classified into three types.
• Opaque
• Transparent
• Translucent

Click on this link to know more about opaque, transparent, and translucent objects.

What happens when light falls on a mirror?
• Light is a form of energy which is responsible for the sense of sight in the human eyes.
• Sometimes, light can be called radiation that is emitted, reflected, or absorbed by different objects.
Mirror:
A mirror is a material made up of glass having a shiny surface. When light falls on a mirror, it is reflected back. So, a mirror changes the direction of light that falls upon it.

Reflection:
The bouncing back of light from a smooth surface is called reflection. Smooth polished surfaces called mirrors can reflect light falling on them in any direction.
Reflection of light

Know the terms,

Incident ray: The light ray that falls on the surface is called the incident ray.

Reflected ray: The light ray that gets reflected from the surface is called the reflected ray.

Normal: It is an imaginary line drawn perpendicular to the reflecting surface at the point where the incident ray strikes the surface or at the point of incidence.

The angle of incidence: The angle between the incident ray and the normal is called the angle of incidence.

The angle of reflection: The angle between the reflected ray and the normal is called the angle of reflection.

Laws of reflection:

The first law of reflection:

The incident ray, the normal at the point of incidence, and the reflected ray all lie in the same plane.

Incident and reflected ray

The second law of reflection:
According to the second law of reflection, the angle of incidence is always equal to the angle of reflection. ($$<i$$ $$=$$ $$<r$$)
Reference:
https://pixabay.com/photos/hands-open-candle-candlelight-1926414/