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light, shade, shadow, sun,

ccd, hubble, light, space, telescope, year,

camp, cell, energy, led, light, multimedia, photoresistor, power, solar, yard,

candela, definition, light, npl, vision, watt,

activity, demonstration, experiment, light, optic, rainbow,

animation, diffusion, electric, electromagnetic, energy, hooke, law, light, revision, sine, spectrum, wave,

acceleration, charge, collision, crash, distance, einstein, electrophorous, electroscope, energy, general, induct, kinematic, light, momentum, newton, optic, parabolic, projectile, r, relativity, rotation, satellite, skid, skydive, sound, static, stopping, vector, velocity, wave, work,

apature, lens, light, mirror, multimedia, optics,

cable, fibre, internal, light, multimedia, optics, reflection, refraction,

index, law, light, multimedia, optics, refraction, refractive, snell,