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_GCloud iridescence is a beautiful atmospheric phenomenon where clouds display shimmering rainbow-like colors, often in pastel shades of pink, green, blue, or purple.
🌈 Why does cloud iridescence happen?
🔹It occurs due to diffraction of sunlight by very small, uniform water droplets or ice crystals in clouds.
🔹When sunlight passes through these tiny droplets
🔹The light waves bend and interfere with each other
🔹Different wavelengths separate, creating soft rainbow colors
☁️ Which clouds show iridescence?
Most commonly seen in:
Altocumulus
Cirrocumulus
Lenticular clouds
These clouds have droplets of nearly equal size, which is essential for the effect.
🌤️ When can you see it?
🔸Near the sun, usually within a few degrees
🔸Best seen when the sun is partly hidden by thicker clouds
🔸Often appears during sunrise or sunset
👀 Is it the same as a rainbow?
No.
Rainbow → refraction + reflection in raindrops
Cloud iridescence → diffraction in tiny cloud droplets
✨ Fun fact
Because the colors are close to the sun, many people miss it—wearing sunglasses or shielding the sun with your hand makes it easier to spot.
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