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Natural sciences

Grade 4

Life and way of living

Module 2

Learn more about the sense of light


To learn more about the sense of light [lo 2.1]

Some wise person has said that the eyes are the windows to the soul of the person, because you are able to see what kind of person you meet when you look into someone’s eyes.

Sight is one of the most important senses, because it gives you an idea of what is happening around you. Your eye needs light to be able to see. Light is reflected from everything around you and enters the eye through the little black hole in the centre of your eye, the pupil . The light may be from the sun or from an electric light bulb. If the light is not bright, the pupils enlarge slightly to allow more light to enter, but when it is bright, they contract. The image is taken via a nerve as a message to the brain.

Complete the illustration of the eye by neatly printing the captions on the lines.

Have a group discussion on the following :

Why do some people wear glasses?

How should we behave towards children in the class who wear glasses?

Cover one eye. Now discuss the usefulness of having two eyes.

Try to catch a ball when one eye is shut.

There are many blind people. Keep your eyes shut tightly for a few minutes. Concentrate on how you feel. How should we behave towards blind people?


LEARNING OUTCOME 2: CONSTRUCTING SCIENCE KNOWLEDGEThe learner will know and be able to interpret and apply scientific, technological and environmental knowledge.

ASSESSMENT STANDARD 2.1: The learner is able to recall significant information.


Captions for illustration of the eye:

  1. eyelid
  2. eyeball
  3. pupil

4. eyelashes

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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