A disc, consisting of seven colours, is mounted on a stand as shown below.
On rotating the disc fast, it will appear
We see the sun's light is bright colour as White colour but when we light a candle it gives a yellowish colour .So,what is present in a candle which gives a yellowish colour instead of a awhite colour as sun has?
A disc in which seven rainbow colours equally spread over an area, which on rotation, fades to white colour is called:
When we heat a coloured salt, it turns into white coloured __________ salt.