RRB Technician Grade 3 previous year question
The far point of a myopic person is 80 cm in front of the eye. Assuming the far point for normal vision is infinity, what is the required power (P) of the corrective lens?
Asked in RRB Technician Grade 3 (10 Mar 2026 Shift 1) · Science
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Correct answer: (D) -1.25 D
For a myopic eye with far point 80 cm = 0.8 m, a concave lens of focal length f = −0.8 m is needed so that objects at infinity appear to be at 0.8 m. Power P = 1/f = 1/(−0.8) = −1.25 D.
हिंदी में प्रश्न
एक निकटदृष्टि दोष से ग्रस्त व्यक्ति की दृष्टि में दूर बिंदु नेत्र के 80 cm आगे होता है। सामान्य दृष्टि के लिए दूर बिंदु को अनंत मानते हुए, संशोधक लेंस की आवश्यक शक्ति (P) कितनी होगी?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) +1.25 D
80 सेमी = 0.8 मीटर दूर बिंदु वाली निकट दृष्टि आंख के लिए, अवतल लेंस की फोकस दूरी f = −0.8 मीटर होनी चाहिए। शक्ति P = 1/f = 1/(−0.8) = −1.25 D होगी।
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