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acceleration angle of incidence apparatus atmosphere axis body Boyle's law bulb Calculate calorimeter centimetre centre of gravity coefficient colours column concave concave lens condenser consequently constant convex lens curve cylinder density determined diameter direction disc displacement distance equal equation expansion experiment fall focal length force formula Hence horizontal hygrometer incident increase index of refraction inside kinetic energy lamp latent heat latter Let us suppose light liquid magnet mass measured mercury metres mirror molecules motion moving parallel particles passes piece placed plane plate pole position pressure prism produced quantity of heat radius ratio reflected refraction refractive index represents result right angles rotation scale screen shown in Fig side specific gravity specific heat spectrum steam substance surface telescope temperature thermometer tube unit vapour velocity vertical vessel vibrations volume wave wave-length weight wire