Question

explain two activities for the formation of artificial raiwnbow?

Answer 1

Select a white coated wall on which the sun rays fall.Stand in front of a wall in such a way that the sun rays fall on your back.Hold a tube through which water is flowing.Place your finger to obstruct the flow of water.Water comes from small gaps between the tube and finger like a fountain.Observe the changes on wall while showering the water.
Activity - II:Take a tray and fill with water.Place a mirror in water such that it makes an angle with water surface.Now focus white light on the mirror through the water.Keep a white card board sheet above the water surface.We may observe the colours VIBGYOR on the board.The splitting of white light into different colours (VIBGYOR) is called dispersion.So consider a white light is a collection of waves with different wavelengths.Violet has shortest wavelength and red has longest wavelength.

Answer 2

hey mate
here is your answer

first activity
A small bowl and a glass is taken.The bowl is filled with water.A glass is placed in the bowl.The bowl containing water and glass is kept in front of a window where sunlight is passing.When the sunlight falls on the glass an artificial rainbow is formed on the wall right to the window.

second activity
A glass prism is taken.Sunlight or a torch of white light is used.When the sunlight or white light falls on the prism it shows the seven colours which is a artificial rainbow.We can see the colours on the prism.

hope it helps you