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Light only travels in straight lines and can only change direction when bouncing off something else

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Humans can not see ultra violet however animals like bees (use it to find flowers by hidden patterns on the flower) and cats and dogs. Some birds can also see in ultra violet

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Info red is also unseeable to the human eye. It’s on the opposite side of the colour spectrum.

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parts:

Pupil - where light enters

Retina - where the light focuses

Optic nerve - takes signals to brain

Cornea - a protective layer

Vilterous gel - transparent liquid (keeps its shape)

Lens - used to focus light

Iris - changes shape to open and close the pupil

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Example: do we need to know about magnetics