Spherical Mirrors
Chapter Name : Light-Reflection And Refraction |
Sub Topic Code : 101_10_10_02_01 |
Topic Name : Spherical Mirrors |
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Sub Topic Name : Spherical Mirrors |
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Introduction
Reflecting surface in this case is curved and is a part of sphere. Laws of reflection are valid for spherical surfaces also.
Pre-Requisites:
Introduction to reflection and laws of reflection.
Activity:
Try to focus the light using any curved mirror, find the distance between the bright spot and the center of the mirror.
Real Life Question:
“What type of mirror we use in the vehicles to the objects behind us?” “Which type of mirror is used in camera in which self-portrait has to be clicked?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Pole of the mirror | It is the center of the reflecting part of the mirror. |
| Concave Mirror | In which the reflecting surface is bend inwards. |
| Convex Mirror | In which the reflecting surface is bend outwards. |
| Center of curvature | The reflecting surface is a part of sphere, center of that sphere is called the center of curvature. |
| Focus | The point where after the reflection incoming rays seems to meet or meet. |
| Aperture | Diameter of the reflecting surface. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Any curved mirror | See image of yourself in it and write the various properties of image formed. |
Real life uses :
Rear view mirror of vehicle, headlights, in the halls of various buildings to observe the people in it. As shaving mirrors, etc.
Places to visit :
Hallways of various buildings, Mirror mazes, fun houses
Practical examples around us
| Examples | Explainations |
|---|---|
| Vehicle rear view mirror | Used to see the other vehicles behind you. |
| ATMs | Convex mirrors are used in ATMs to see the happenings behind them. |
What you learn in Theory:
When ray of light falls on any curved mirror, it passes through or appears to pass through a point called Focus. Also the radius of the curvature of the mirror is twice the focal length.
What you learn in Practice:
Curved mirrors also follow the laws of reflection and they have uses in the practical life. We can concentrate the sun light using curved mirrors to provide the heating effect in the winters.