- 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.
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.
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.
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. (\(<i\) \(=\) \(<r\))