Atmosphere - Gaseous envelope surrounding the earth, Conductor - Materials that allow electrons to flow through them, Baroeter - Instrument used to measure atmospheric pressure at a place, Newton - SI unit of pressure, Joules - SI unit of heat, Pressure - Force acting per unit area of a surface, Focal length - Distance between the optical centre and principal focus of a lens, Energy - Ability to do work, Hypermetropia - A person suffering from this cannot see nearby objects clearly, Fuels - Substances that produce useful energy, Refraction - Bending of light as it moves from one medium to another., Myopia - A person suffering from this cannot see distant objects clearly, Dispersion - Splitting of white light into its component colours,

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Estil visual

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