CBSE Class 10 Ch. 9 Physics part 13| Light Reflection and Refraction|
CBSE Class 10 Ch. 9 Physics part 13| Light Reflection and Refraction|
Hence, light reflection occurs when the beam of light bounces back to the same surface after striking the surface of any object. Light refraction occurs when the medium of light gets changed from one form to another form.
Class 10 light chapter describes light as an essential element which makes things visible to us. Light originates from a point source and then bounces back as perceived by the eyes. Technically, light is the representation of a form of energy that results from the sensation of sight. Hence, light reflection occurs when the beam of light bounces back to the same surface after striking the surface of any object. Light refraction occurs when the medium of light gets changed from one form to another form.
Incident Light– Incident light or incident ray falls on the surface of the object
Lightray- it is the line that forms the uni or bi-directional wave
Light beam- it is the bunch of light rays
Parallel beam- it has the parallel light rays
Reflected Light– Reflected light or reflected ray goes back to the medium after reflection
The Angle of Incidence– It is the angle formed between the reflected ray and normal (normal is the plane)
Principal axis– it is the line joining the centre of curvature and pole of a spherical mirror
Pole- it is the geometrical Central point of are reflecting spherical surface which is denoted by P
Aperture- Aperture is the width of the reflecting spherical surface
Centre of curvature- the centre of curvature is the centre of a hollow spherical mirror
The radius of curvature- the distance between the centre of curvature and the pole is known as the radius of curvature. The radius of curvature of the hollow sphere refers to the part of the mirror.
Focus Point- the point on the principal axis where parallel light rays meet after the reflection is known as the principal focus or focal point. It is denoted by F
Focal length– the distance between the focus point and pole is known as the focal lengt
Laws of Reflection of Light
There are two laws of reflection. Class 10 light chapter explains both of them in detail. Let’s understand them further in detail:
The angle of incidence is always equal to the angle of reflection.
The incident ray, the reflected ray, and the normal/perpendicular at the point of incidence lie in the same plane.
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