Chapter: 3 Movement in & out of Cells


Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985 Focus light



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CIE-IGCSE-Chap-12-Coordination & Homeostasis


Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985

Focus light .

  • For the brain to see a clear image, there must be a clear image focused on the retina.
  • Light rays must be bent so that they focus exactly onto the retina.
  • Bending light rays is called refraction.
  • Most refraction of the light entering the eye is done by the cornea.
  • The lens makes fine adjustments.

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985

Adjusting the focus

  • Not all light rays need bending by the same amount to focus them onto the retina .
  • Light rays coming from an object in the distance are only diverging slightly.
  • They do not need much bending.

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985

Adjusting the focus


Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985

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