What enters the eye to let us see colours?What do you see in a mirror?, Light, Name a valuable, extremely hard, colourless gemstone, Diamond, What are lenses, windows and prisms usually made of?, Glass, What do we call something that can be seen through clearly?, Transparent, What do we call something that does not transmit light?, Opaque, Where on an object is the light absorbed or reflected?, The surface, Give a word that means a picture formed by light., Image, What do you see in a mirror?, A reflection, What do we call the line at right angles to a surface or interface?, The normal, What is the scientific term for the incoming light ray?, The incident ray, Name the main optical component in spectacles(glasses) and telescopes, A lens, Which colour surface reflects all incident light equally?, White, Which colour surface absorbs all incident light?, Black, What is the scientific term for the colours of the rainbow?, Spectrum, What do we call something that lets light through but does not let us see clearly?, Translucent, What do we call the change in direction of a light ray when it moves from one medium to another?, Refraction.

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