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Light

QuestionAnswer
Luminous objects that give off their own light (e.g. sun)
Non-luminous objects that do not produce their own light but reflect light (e.g. moon)
Transparent Allowing light to pass through
Translucent Allows some light to pass through but can't be seen through clearly
Opaque Does not let light through
Properties of light Is a wave and travels in straight lines
Reflection the bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through
Law of reflection angle of incidence = angle of reflection
Refraction When light changes direction as it passes from one medium to another (e.g. air to water)
Concave Surface that curves inwards
Convex Surface that curves outward
Parallel rays through concave lens The rays spread apart
Parallel rays through convex lens The rays come together
Colours of visible spectrum red, orange, yellow, green, blue, indigo, violet
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