दीर्घवृत्त के नाभिलंब की लम्बाई क्या है?

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Airforce Group X 5 November 2020 Memory Based Paper
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  1. 10
  2. 12
  3. 15
  4. 20

Answer (Detailed Solution Below)

Option 3 : 15
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संकल्पना:

एक दीर्घवृत्त का मानक समीकरण: (a > b)

  • फोकस के निर्देशांक = (± ae, 0)
  • उत्केंद्रता (e) =  ⇔ a2e2 = a2 – b2
  • नाभिलंब की लम्बाई = 

 

गणना:

दिया गया है: 

एक दीर्घवृत्त के मानक समीकरण के साथ तुलना करने पर: 

इसलिए, a2 = 100 और b2 = 75

∴ a = 10

नाभिलंब की लम्बाई = 

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