In the process of rainbow formation in the sky, every raindrop in the atmosphere acts like-

Correct option is A

The correct answer is (a) Glass prism.
· In the process of rainbow formation, every raindrop acts like a glass prism. When sunlight enters a raindrop, it is refracted, dispersed, and then reflected inside the drop.
· The light is split into its constituent colors (dispersion) and emerges as a spectrum of colors, creating the rainbow.
· The phenomenon involves refraction as the light enters the raindrop, reflection within the drop, and refraction again when it exits.
Additional Knowledge:
· Glass slab - A glass slab would not produce dispersion as a prism does. It refracts light but does not separate it into colors like a prism.
· Mirror - Mirrors reflect light, but they do not refract or disperse light into a spectrum like raindrops or prisms.
· Lens - A lens can refract light, but it does not cause the dispersion needed to form a rainbow.