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प्रश्न
Explain the following:
Why does a crack in window pane, sometimes appear silvery?
स्पष्ट कीजिए
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उत्तर
A crack in a window pane contains air. When light travelling through the glass strikes the glass–air boundary at an angle greater than the critical angle, it undergoes total internal reflection. The reflected light makes the crack appear silvery.
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