From NCERTAsked by Anonymous from Mountain View, United States1 Oct 2026, 7:51 AM ISTUpdated
In one line
Two people cannot see exactly the same rainbow, but they can see rainbows that look almost the same from nearby spots.
Rainbow — Meteorological phenomenon A real rainbow, showing how sunlight and raindrops create the arc of colors. Image: Wikipedia
The rule
A rainbow is formed when sunlight is bent (refracted), bounced (reflected), and spread out (dispersed) by raindrops in the air, creating a circle of colors that appears in the sky.
Let's understand it simply
Imagine you and your friend are standing in a field after rain. The sun is behind you, and you both look at the sky. Each of you sees sunlight entering different raindrops, bouncing inside, and coming out at a special angle (about 42° for red light). The rainbow you see is made by light from a set of raindrops just for your eyes. Your friend, standing even a few steps away, gets light from a different set of raindrops. So, you both see rainbows in the same place in the sky, but not from the exact same drops.
How it works
Sunlight shines behind you and hits raindrops in front of you.
Each raindrop bends (refracts) the light, splits it into colors, and reflects it inside.
The colored light comes out at a fixed angle (about 42° for red) from each drop.
Your eyes catch light from many drops at just the right angle to form a rainbow.
Someone standing next to you sees their own set of drops at the same angle, so the rainbow appears in the same place but is made by different drops.
How a rainbow forms for each person
Sunlight shines behind you.
Light enters raindrops and bends.
Colors split and bounce inside the drop.
Colored light exits at a special angle.
Your eyes catch light from certain drops; your friend catches light from others.
The story behind it
People have wondered about rainbows for thousands of years. In the 1600s, René Descartes and Isaac Newton studied how light bends and splits in raindrops. Newton showed that white sunlight is made of many colors, which spread out to form the rainbow. Descartes explained the angles and how each person sees their own rainbow.
Where you see it in real life
After rain, when the sun comes out and you look opposite the sun.
Spraying water with a hose in the garden on a sunny day.
Mist from a waterfall, like at Jog Falls, showing a rainbow in the spray.
Dew on grass in the morning, sometimes making tiny rainbows.
Through the spray from a pressure cooker in sunlight.
Why it matters
Shows how light bends and splits, a key idea in science.
Used in optics (study of light), which helps make glasses, cameras, and microscopes.
Helps us understand weather and how sunlight interacts with water.
The idea of each person seeing their own rainbow is used in art and photography.
Common mistakes
Thinking everyone sees the exact same rainbow: Each person sees a rainbow from different raindrops.
Believing you can touch or walk to the end of a rainbow: The rainbow moves as you move, so you can never reach its end.
Remember it
A rainbow is personal: you see it from your own spot, made by your own set of raindrops.
Check yourself
Why can't two people see the exact same rainbow?
Because each person sees light from different raindrops at the right angle for their eyes.
If you move towards a rainbow, does it move too?
Yes, the rainbow seems to move because your position changes which raindrops make the rainbow for you.
Where should the sun be for you to see a rainbow?
The sun must be behind you, and rain or water drops in front of you.
Quick recap
Each person sees their own rainbow, made by different raindrops.
Rainbows form when sunlight bends, reflects, and spreads in raindrops.
You cannot touch or reach the end of a rainbow.
Rainbows look similar for people standing close, but are not exactly the same.
