Human Eye
Chapter Name : Human Eye And Colorful World |
Sub Topic Code : 101_10_11_01_02 |
Topic Name : Human Eye |
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Sub Topic Name : Power Of Accommodation |
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Introduction
When we come into dark from light or come into light from dark, lens in our eye changes its focal length to adjust with the light.
Pre-Requisites:
Introduction about basic parts of eye.
Activity:
Try to read a page near to your eye, stop it when you starts feeling strain on you eyes. Calculate that distance with ruler and find the least distance of vision.
Real Life Question:
"Why we are not able to see things instantly when we come into dark from the light, but after some time we can see those things?"
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Power of accommodation | Ability of eye lens to adjust its focal length depending on the light. |
| Near point of the eye | Minimum distance at which a person can see the things without strain on the eyes. |
| Cataract | Due to old age eye lens of the people becomes milky and cloudy, this is called cataract. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|
Real life uses :
This helps us in watching the things clearly even in the dark.
Places to visit :
School Physics lab, An eye doctor's clinic.
Practical examples around us
| Examples | Explainations |
|---|---|
| Our eye | it adjusts its focal length depending on the amount of light. |
What you learn in Theory:
The ability of the eye lens to adjust its focal length is called accommodation.
What you learn in Practice:
Our eye lens contracts and expands when we come into light or come into dark respectively, makes us able to see things clearly.