Physics Unit 3 Revision Cards 3.0 / 5 based on 1 rating ? PhysicsGCSEAQA Created by: ab1410Created on: 05-04-13 10:52 What are X-rays used for? X-rays are used to produce images of the inside of your body 1 of 14 Compared to visable light what are there frequency and wavelength? they have a shorter wavelength and a higher frequency 2 of 14 What is ultrasound? Ultrasound is sound waves above our frequency (20Hz to 20,000Hz) 3 of 14 What is the equation used to find the distance travelled of the ultrasound wave? distance travelled=speed of sound through material x time taken 4 of 14 What is the equation for refractive index? sine of the angle of incidence/sine of the angle of incidence 5 of 14 What is Snell's Law? Snell's Law is a physics equation that describes how the light is refracted when it travels from one medium to a different one 6 of 14 Is a convex lens a converging or diverging lens? Converging 7 of 14 What does the image of a pinhole camera look like? It is real, inverted (upside down) and diminised (smaller) 8 of 14 What is the equation for refractive index? the equation for refractive index is 1/the sin of the critical angle 9 of 14 How can a fibre optic christmas tree work? The light reflects off the glass fibre going to each individual fibre until they reach the top and the light filter at the bottom that changes light. 10 of 14 What does the cornea do? The Cornea refracts most of the light 11 of 14 What does the lens do? The lens provides further refraction before reaching the retina 12 of 14 What does the optic nerve do? The optic nerve carries the information to the brain 13 of 14 What is diopter? Diopter is a measurement of power of a lens and curved mirror 14 of 14
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