straight - Light travels in ________ lines, reflection - Angle of incidence is equal to the angle of __________, normal - An imaginary line at 90° to the point on a surface where a light ray strikes the surface, critical - Total internal reflection will occur if the angle of incidence is greater than the ________ angle, refraction - The change of speed of a light ray passing from one substance to another, towards - A ray that slows down will move _______ the normal, concave - A lens that is "skinny" in the middle, also called a diverging lens, power - 1/focal length gives this value for a lens, dioptre - The unit of lens power, green - The primary colours of light - red, blue & _____, filter - An object that lets some frequencies of light through, but blocks others, metre - The base unit of focal length, virtual - A type of image that cannot be formed on a screen, magnified - An enlarged image, opposite of diminished, inverted - Upside down, opposite of upright,

S3 Light & Optics wordsearch

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