Physics 3 0.0 / 5 ? PhysicsBits of P3 eg lensesGCSEAQA Created by: SarahCreated on: 22-03-14 14:51 What type of lens is use for magnifying glasses? Convex 1 of 13 What type of lens is used for long sighted people? Convex/converging 2 of 13 What type of lens is used for short sighted people? Concave/diverging 3 of 13 2 materials X-rays are absorbed by bone and metal 4 of 13 What is refractive index? The ratio of speed to light in a vacuum to in the medium 5 of 13 What is the focal length? the distance from the centre of the lens to the principal focus 6 of 13 What is the principal focus (converging lens)? where rays hitting the lens parallel to the axis all seem to meet 7 of 13 What is the principal focus (diverging lens)? Where rays hitting the lens parallel to the axis appear to come from 8 of 13 How can you tell something is a real image? the light can produce an image on the screen 9 of 13 The curvier the lens.. the more powerful it is 10 of 13 Pressure in a liquid is.. transmitted equally in all directions 11 of 13 What is the force that keeps things moving in a circle? Centripetal 12 of 13 What are CCDs silicon chips with identical pixels 13 of 13
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