How to Solve Light Year for Class 8

What does it mean to solve a quadratic equation by 'completing the square'? Here it is explained visually. A general solution to the cubic equation was long considered impossible, until we gave up the requirement that math reflect reality.

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$Prove the statement. A rainbow is the combined effect of the refraction, dispersion, and total internal reflection of light. - Science and Technology 1 | Shaalaa.com$

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$Dispersion in diamonds refers to the separation of white light into its constituent colors (the rainbow effect) as it passes through the diamond, resulting in the visual "fire" that diamonds are known for. This phenomenon is due to the diamond's high refractive index, which causes different wavelengths of light to bend at slightly different angles as they enter and exit the stone. | Gemologist ماہر علم جواہریات$