2/18/2023 0 Comments Dispersio of lightRays from object are totally reflected until they enter the eye. Transmission of light rays through the periscope They are used in prism binoculars and periscopes.They are used as reflecting surfaces with minimal energy loss.They are used in the dispersion of light emitted by glowing objects.They enable the refractive index of a glass material to be measured accurately.The spectrum is then directed to the screen by lens 2. This beam then falls into prism where dispersion of white light occurs.An illuminated slit is placed at the principal focus of a converging lens, so that a parallel beam of light emerges from it.White light is separated into seven colours by a prism because (he prism has different refractive index for the different colours of white, light Iii) The prism has different refractive index for different colours. Ii) The prism merely separates the colours of white light by deviating red light least and violet light most and other colours are deviated to varying intermediate extent, I) White light is a mixture of seven colours The colours of the spectrum can be recombined to form white light by arranging two prisms as above so that the, light is deviated in the opposite direction. The process of obtaining colours in this way is called colour mixing by subtraction. The overlap of Cyan and Magenta filter give blue filter because cyan absorbs red light and transmits blue and red light so blue is transmitted. The overlap of yellow and magenta gives red light because the magenta filter absorbs Green and transmits blue and red light is yellow filter absorbs blue and transmits red and Green so red light is transmitted. Green light is seen where white light passes through both filters.įor the overlap of yellow and cyan: Cyan filter absorbs the red light and transmits green and blue, but the yellow filter absorbs blue light and transmit green and red (which absorbed by the cyan filter) so only green is transmitted When a yellow filter and cyan filter are placed at some distance from the ray box such that, half of their portions overlap. Mixing coloured pigments is called mixing by subtraction. Mixing coloured light is called mixing by addition. Yellow + blue reflects green, absorbs orange, yellow and blue. Yellow paint reflects orange, yellow and green, while blue paint reflects green blue and indigo. When two pigments are mixed, they reflect the colour which is common to both and absorb all the other, e.g. Pigments in dyes are impure and reflect more than one colour light. Secondary Colours: A secondary colour is one which is obtained by mixing two primary coloursĬomplimentary Colours These are two colours which give white when mixed Primary colours are those that cannot be obtained by mixing any other colours. Opaque objects: They do not allow light to pass through.
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