concave mirror - the type of mirror that converge the reflected rays, the angle of incidence equals the angle of reflection - Law of reflection, lens - the part of the eye that refracts and converges light, the percentage of useful energy over input energy - energy efficiency, potential energy - the type of energy that is stored inside an object, iris - the part of the eye that controls the amount of light entering the eye., electrical - the main type of energy that is used by a fridge, the colour that contains all other seven colours - white, wavelength - the distance between two consecutive crests, or troughs, the type of energy that causes movement - kinetic, sound wave - the most common longitudinal wave from our life, special cells on the back of the eye that receive light and turn it into electrical signals - retina, cornea - thick protective layer on the outside of the eye, the type of waves that vibrate at right angles (perpendicular) to the direction of travel - transverse wave, describes how big a wave is - amplitude, energy can only be transformed or transferred - Law of energy conservation, it absorbs all other colour but reflect yellow - banana is yellow colour because....., optic nerve - transmit the electrical signal to the brain for interpretation, the energy that is stored in a battery - chemical potential energy, the energy that is stored in a rubber band - elastic potential energy,

Year 9 Physics Revision

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