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Why do Green house gases allow light (heat) rays/waves in one direction only from the earth to the sun?

April 26, 2017direction earth gases heat House light Rays waves

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Why do Green house gases allow light (heat) rays/waves in one direction only from the earth to the sun?

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The solar radiation coming from the sun and passing through the green house gases have shorter wave length whereas the thermal radiation reflected from the Earth’s surface has longer wave lengths. The greenhouse gases trap the reflected radiation only.