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दोषपूर्ण दृष्टि वाला व्यक्ति 1.5 मीटर से अधिक निकट की वस्तुओं को स्पष्ट रूप से देखने में असमर्थ होता है। वह अपनी आंखों से 30 सेमी की दूरी पर रखी एक किताब पढ़ना चाहता है। एक आवश्यक लेंस का प्रकार और इसकी फोकस दूरी है?
  • a)
    अवतल लेंस, f = 37.5 cm
  • b)
    उत्तल लेंस, f = 30.5 cm
  • c)
    उत्तल लेंस, f = 37.5 cm
  • d)
    अवतल लेंस, f = 30.5 cm
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
1.5 30 ?a) , f = 37.5 cmb) , f...
यह व्यक्ति हाइपरमेट्रोपिया के दोष से ग्रस्त है।
उसके लिए u = -30cm, v = -1.5 m = -150cm
इसलिए, उसके द्वारा उपयोग किए जाने वाले सुधारात्मक लेंस की फोकस दूरी है
1/f = 1/v- 1/u = 1/-150 - 1/-30 = 4/150 =
37.5 सेमी धनात्मक चिन्ह दर्शाता है कि जिस लेंस की आवश्यकता है वह फोकल लंबाई 37.5 सेमी का उत्तल लेंस है।
इसलिए, आवश्यक लेंस की क्षमता
P = 1/f = 100/37.5 = 2.67D
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