Write an activity to show the dispersion of light to get seven colours through prism.Write the material required and procedure.
Answers
Aim :
To show the Dispersion of light to get seven colours using Prism.
Apparatus :
Prism, source of white light, white screen
Procedure :
A beam of white light is passed through Prism and the spectrum is captured on a white screen.
Observation :
---> When white light enters prism, first it surfers refraction and towards normal bends towards normal as they slow down they speed.
---> white light splits into 7 different colours.
---> Again refraction occurs at secondary surface of prism and moves away from the normal as they gain speed.
---> The red colour is having the maximum speed so it is deviated least.
---> Red colour forms at the top of the spectrum.
---> Violet colour has minimum speed so it is deviated more and will be formed at bottom of spectrum.
---> a band of colours VIBGYOR are formed on the screen.
