notes of light class 8
Answers
Answer:
Our eyes alone do not allow us to see. Light from a source falls on an object and then bounces off onto our eyes and that is how we perceive it.
Light 1
Laws of Reflection
Reflection
Light gets reflected off surfaces. Any surface that is really well polished or shiny acts as a mirror. The phenomenon of light bouncing off surfaces is called reflection.
Light 2
Laws of reflection
The ray of light that strikes a reflecting surface is called the incident ray and the ray that gets reflected back is called the reflected ray.
The imaginary line that is perpendicular to the reflecting surface is called the normal.
The angle of incidence ∠i is the angle between the incident ray and the normal. The angle of reflection ∠r is the angle between the reflected ray and the normal.
Laws of Reflection: Angle of incidence ∠i is always equal to the Angle of reflection ∠r (∠i=∠r). The angle of incidence, the angle of reflection and the normal all lie on the same plane.
To know more about Laws of Reflection, visit here.
Ray Diagram
The path taken by a narrow beam of light is depicted as a ray diagram.
Ray diagram
Answer:
Light is an electromagnetic radiation of any wavelength.
Light is a form of energy with which a human eye makes the things visible. Light from stars, fire, sun, glowing coils, electric bulb, flashlights are some of the example of light.
It travels in a straight line. The Sun is the ultimate source of the light.