Topic 5 0.0 / 5 ? PhysicsOpticsASAQA Created by: Jemma1494Created on: 02-06-21 17:39 Red light Longer wavelength Causes wider fringe separation Low frequency 1 of 12 Blue light Shorter wavelength Causes smaller fringe separation High frequency 2 of 12 Monochromatic light Light of one colour Best for optical fibres 3 of 12 Optical fibres Tubes that use total internal reflection to transmit signals 4 of 12 What effect does a wide optical fibre tube have Increases modal dispersion and leads to a less accurate signal 5 of 12 Conditions for total internal reflection Light travelling from a more dense -> less dense substance Indecent angel > critical angle 6 of 12 Critical angle The smallest angle needed for a wave to be totally internally reflected Sinθc = n2/n1 (N2 being the index value for the less dense substance) 7 of 12 Angle rules for refraction n1 sin(i) = n2 sin(r) n= sin(i)/sin(r) 8 of 12 Index value The value relating to the density of a substance 9 of 12 Double slit interference equation W = λD/s (W = fringe width) (s = slit separation) 10 of 12 Coherence Light source of the same frequency and constant phase difference 11 of 12 Diffraction grating equation dsinθ =nλ 12 of 12
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