Spherical Mirrors
Chapter Name : Light-Reflection And Refraction |
Sub Topic Code : 101_10_10_02_02 |
Topic Name : Spherical Mirrors |
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Sub Topic Name : Image Formation By Spherical Mirrors |
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Introduction
Properties of the images formed are different in the case of curved mirror than plane mirror.
Pre-Requisites:
Introduction to reflection and laws of reflection. Basic properties of spherical mirrors.
Activity:
Try to focus the light using any curved mirror, find the distance between the bright spot obtained and the center of the mirror?
Real Life Question:
“What type of mirror we use in the vehicles to the objects behind us?” “Why we see distorted image of ourselves when we look into curved mirrors?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Focal length | It is the distance between the focus and the pole of the mirror. |
| Diminished Image | Very small image formed of an object. |
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 :
Concave mirrors are used in headlights of cars, dentist uses this type of mirror.
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:
A concave mirror always forms real and inverted image except when the object is placed between the pole and focus. In that case the image formed is virtual and erect.
What you learn in Practice:
In shaving mirrors we keep our face between pole and the focus of the mirror, to see the image erect.