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एक मछली पानी के अंदर sqrt(7) cm की गहर...

एक मछली पानी के अंदर `sqrt(7)` cm की गहराई पर तेर रही है। मछली पानी के बाहर केवल वृताकार भाग से देख सकती है। इस वृताकार भाग की त्रिज्या कितनी होगी । हवा के सापेक्ष पानी का अपवर्तनाक `4/3` है ।

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`7.336m^(2)`
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A conical cup is fined with ice-cream. The ice-cream forms a hemispherical shape on its open top. The height of the hemisphierical part is 7 cm, The radius of the hemispherical part equals to the height of the cone. Then the volume of the ice-cream is [ pi = 22/7] एक शंक्वाकार कप आइसक्रीम से भरा है। आइस्क्रोम अपने खुले शीर्ष पर अर्धगोलाकार आकृति बनाती है । अर्धगोलाकार भाग की ऊँचाई 7 सेमी है । अर्धगोलाकार भाग की त्रिज्या शंकु की ऊँचाई के बराबर हैं। आइसक्रीम का आयतन कितना होगा. ? [ pi =22/7]

The volume of a right circular cone is equal to that of a sphere, whose radius is half the radius of the base of the cone. What is the ratio of the radius of the base to the height of the cone ? एक लम्ब वृत्तीय शंकु का आयतन उस गोले के आयतन के बराबर है, जिसकी त्रिज्या शंकु के आधार की त्रिज्या से आधी है | शंकु के आधार की त्रिज्या और शंकु की ऊंचाई में क्या अनुपात है ?

MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-PRACTICE PROBLEMS (3)
  1. Calculate the critical angle for a pair of media, water and glass. Giv...

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  2. The refractive index of glass is 1.5. Calculate the speed of light in ...

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  3. A rectangular box of dimension 15 xx 10xx7 cm is made out from a trans...

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  4. A glass slab when placed in air has a critical angle of 40^(@). Calcul...

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  5. The ray of light is incident at an angle of 45^(@) on a glass surface....

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  6. A point light source is attached to the base of an empty trough. A tra...

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  7. A salt water lake has refractive index 1.4. A fish when looks towards ...

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  8. एक मछली पानी के अंदर sqrt(7) cm की गहराई पर तेर रही है। मछली पानी ...

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  9. A prism made of material with refractive index 1.6 has a prism angle o...

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  10. A prism made of refractive index x has prism angle of 50^(@). A light ...

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  11. An equilateral prism is made of material with refractive index 1.73. A...

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  12. प्रकाश की एक किरण वायु से समबाहु त्रिभुजाकार कांच के प्रिज्म से अल्पतम...

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  13. An equilateral prism of unknown refractive index has a prism angle A. ...

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  14. A prism of prism angle 50^(@) has angle of minimum deviation 30^(@). ...

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  15. A prism of refractive index 1.53 is placed in water of refractive inde...

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  16. A prism has a prism angle 60^(@). A light ray incident at an angle of ...

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  17. An equilateral prism has a refractive index equal to 1.56 for the ligh...

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  18. If a small angled prism, made of glass is immersed in a liquid of refr...

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