Refraction Of Light
Chapter Name : Light-Reflection And Refraction |
Sub Topic Code : 101_10_10_03_01 |
Topic Name : Refraction Of Light |
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Sub Topic Name : Refraction Of Light |
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Introduction
We often see the stars twinkling in the sky, broken pencil in the water. These are due to the refraction of light.
Pre-Requisites:
Basic knowledge about properties of light.
Activity:
Take a glass plate, put that on the paper and see the letters written on the paper raised up.
Real Life Question:
“Why we see a pool of water at some distance on the road in the days of summer?” “Why we see a coin raised up a little bit in the bucket full of water?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Refraction | When light enters in a different medium, it changes its path in the same direction. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| A bucket full of water | We can see a coin raised up in the bucket of water. |
| Glass plate | When we observe a paper through the glass plate we see the letters raised, is due to the refraction. |
Real life uses :
In optometry, to detect the eye’s error and also to correct it. Useful in propagation of sound in the water.
Places to visit :
You can see the various examples of refraction at your home itself. Coin in the bucket of water, broken pencil, raised letter under glass plate.
Practical examples around us
| Examples | Explainations |
|---|---|
| Rainbow | Seven colors of the rainbow are due to the refraction itself. |
| Mirages | A natural phenomenon in which we see the object displaced from its position. |
What you learn in Theory:
When light travels obliquely from one medium to another, the direction of propagation of light in the second medium changes. This phenomenon is known as refraction of light.
What you learn in Practice:
Speed of light changes when it changes the medium of propagation. This is the basic principal of various examples of refraction around us.