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प्रश्न
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
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उत्तर
When the sun is setting, the light from it has to travel a greater thickness of the earth's atmosphere and only the longer wavelength red light is able to reach us. Sunset is therefore red in colour.
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