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एक तालाब (जिसमें जल भरा है) की तली में स्थित वस्तु की आभासी गहराई 9 मीटर है। इसकी वास्तविक गहराई ज्ञात कीजिये। जल का अपवर्तनांक है।

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सूत्र- `d_(app)=(d)/(mu)` से
`d=d_(app)xxmu`
प्रश्नानुसार, `" " d_(app)=9` मीटर, `mu=4//3`
`:. " " d=9xx(4)/(3)=12` मीटर

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