Question

what is rainbow? write two conditions necessary in the formation of rainbow

Answer 1

rainbow is an arch of seven different colours visible in the sky which is produced to the dispersion of sunsm's white light by the air molecules presently in the atmosphere

the two conditions necessary for the formation of a rainbow are as follows
sun should be at the back of the observer
presence of water droplets in the atmosphere

Answer 2

the rainbow is an Arc of seven colour visible in the sky which is produced by the Dispersion of Sunlight by raindrop in the atmosphere
the condition necessary in the formation of rainbow when the sun is shining and it is raining at the same time
hope its help you