Question

Write an activity to observe a spectrum with the help of prism for class 7th

Answer 1

please mark as brainlist answer

Answer 2

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