Class 10 Chapter : Light : Reflection and Refraction Part 1
Reflection
Introduction:
Light is a
form of energy that allows us to see. Light travels in straight lines until it
interacts with matter. In this chapter, we will explore two important phenomena
related to the interaction of light with matter: reflection and refraction.
Optics:
topic of light is studied in branch of physics called optics. There are
two sub branches of optics. Ray optics
and wave optics.
·
Reflection:
Reflection is phenomenon of change in path of light without change in medium.
Types of
Reflection:
- Specular Reflection: Occurs on smooth, polished
surfaces like mirrors. The reflected rays are parallel and form a clear,
well-defined image.
Diffuse Reflection: Occurs on rough surfaces like walls or paper. The reflected rays are scattered in different directions, and a clear image is not formed.
Laws of
Reflection:
1. The incident ray, the reflected
ray, and the normal (a line drawn perpendicular to the reflecting surface at
the point of incidence) all lie in the same plane.
2. The angle of incidence (angle
between the incident ray and the normal) is always equal to the angle of
reflection (angle between the reflected ray and the normal).
Mirror: A mirror is a
smooth, polished surface with one side that reflects light, creating images,
while the other side is typically opaque."
|
Feature |
Plane
Mirror |
Spherical
Mirror |
|
Surface |
Flat |
Curved |
|
Image
Formation |
Virtual,
erect, same size |
Can be
real/virtual, erect/inverted and vary in size |
|
Types |
One type |
Two types: Concave and Convex |
|
Applications |
Everyday
mirrors, dental mirrors, reflecting telescopes |
Shaving mirrors, makeup mirrors, reflecting telescopes,
headlights (concave); Rear view mirrors, security mirrors, ornaments (convex) |
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