Card 1
HintThink of a light bulb or the sun.Memory TipLuminous objects: 'illuminate us'.
Card 2
HintMost objects around you fall into this category.Memory TipNon-luminous objects: 'need light to be seen'.
Card 3
HintConsider a clean window pane.Memory TipTransparent: 'lets light transfer.'
Card 4
HintThink of a metal door or a thick book.Memory TipOpaque: 'Obstruction of light's pathway.'
Card 5
HintConsider frosted glass or tissue paper.Memory TipTranslucent: 'light transferred, blurred scene.'
Card 6
HintPencil in a glass of water appears bent.Memory TipRefraction: 'light's redirection.'
Card 7
HintLike the lens in your eye.Memory TipConvex: 'Converges to a point, ex is out.'
Card 8
HintThe opposite of a convex lens.Memory TipConcave: 'caves in, spreads rays away.'
Card 9
HintActive in low light conditions.Memory TipRods: 'see in the dark roads.'
Card 10
HintAllow you to see different colors.Memory TipCones: 'detect colors in sunshine zones.'
Card 11
HintThink of a rainbow.Memory TipSpectrum: 'split light, colors connect 'em.'
Card 12
HintCreated by a disturbance.Memory TipWaves: 'energy in motion, notation.'
Card 13
HintRelated to the energy of the wave.Memory TipAmplitude: 'height shows wave's might.'
Card 14
HintMeasured in Hertz (Hz).Memory TipFrequency: 'waves that frequently retry.'
Card 15
HintDistance of one full wave cycle.Memory TipWavelength:'wave's full length.'
Card 16
HintLight waves are an example.Memory TipTransverse: 'vibration across, no reverse.'
Card 17
HintSound waves are an example.Memory TipLongitudinal: 'vibration along, sound's strong.'
Card 18
HintLike a ball bouncing off a wall.Memory TipReflection: 'waves bounce, same pronouncement.'
Card 19
HintRelated to the frequency of the sound wave.Memory TipPitch: 'highness of sound hitch.'
Card 20
HintA larger amplitude means a louder sound.Memory TipLoudness: 'amplitude determines proudness.'