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JSS3: BASIC SCIENCE - 2ND TERM

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  1. Light Energy | Week 1
    2 Topics
  2. Reflection of Light | Week 2
    5 Topics
    |
    1 Quiz
  3. Sound Energy | Week 3
    4 Topics
  4. Sound Energy - Echoes, Hearing | Week 4
    2 Topics
    |
    1 Quiz
  5. Electrical Energy - Concept of Electrical Flow | Week 5
    2 Topics
  6. Arrangement of Resistors | Week 6
    3 Topics
  7. Electrical Meter Reading and Billing | Week 7
    2 Topics
    |
    1 Quiz
  8. Magnetism | Week 8
    2 Topics
  9. Laws of Magnetism | Week 9
    4 Topics
    |
    1 Quiz
  10. Radioactivity | Week 10
    5 Topics
    |
    1 Quiz



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The image is interpreted the right way up by the brain which is connected to the eye via the optic nerve.

Light rays falling on the cornea, which is a transparent dome-like structure covering the iris, are refracted (bent) towards the pupil, on entering the pupil the light rays strike the lens. The light rays are refracted a second time whilst passing through the lens, which focuses the light directly onto the retina, where the image is formed but inverted (upside down).

eye cross section
Cross-section of the human eye.

Impulses are sent along the optic nerve to the optic lobe of the brain, and finally to the visual centre of the cerebrum, where the image is interpreted the correct way and actually seen. 

vision images captured eyes processed by our brain

The eye is able to focus both far and near objects on the retina by the action of ciliary muscles.  

vision

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