Optics and Vision - Part 1
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Light travels in ___________ lines from its source, it cannot bend around objects (CURVED or STRAIGHT?)
STRAIGHT
What is the difference between umbra and penumbra?
Umbra: fully shaded region. Penumbra: partially shaded region.
What is a luminous object? Give two examples.
Objects that produce light. Ex.: Sun, light bulb, flashlight, fire.
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