A concave lens is used in:
A concave lens is used in:
अवतल लेंस का उपयोग किसमें किया जाता है?
Detailed Solution & Logic
Glasses for myopia (short-sightedness)/दृष्टिदोष (मायोपिया) के चश्मे
Explanation / व्याख्या
A concave lens is a diverging lens. It spreads light rays outward, helping to correct myopia (short-sightedness), where a person can see nearby objects clearly but distant objects appear blurry.
अवतल लेंस एक अपसारी (diverging) लेंस होता है। यह प्रकाश किरणों को फैलाता है। इसका उपयोग मायोपिया (निकट दृष्टिदोष) को ठीक करने में किया जाता है, जिसमें व्यक्ति पास की वस्तुएँ तो साफ देखता है लेकिन दूर की वस्तुएँ धुंधली दिखाई देती हैं।
Key Facts / महत्वपूर्ण तथ्य
- 👁️ Used in myopia correction (निकट दृष्टिदोष)
- 🌈 Forms virtual, erect, and diminished image
- 🔦 Diverges light rays (प्रकाश को फैलाता है)
❌ Why others are incorrect / अन्य विकल्प गलत क्यों हैं
- 🔭 Telescope / दूरबीन: Uses convex lenses and mirrors
- 📽️ Projector / प्रोजेक्टर: Uses convex lens to magnify image
- 📷 Camera / कैमरा: Uses convex lens to focus light on sensor
Simple trick / याद रखने का तरीका
👉 “Concave lens = Myopia (दूर की चीज़ धुंधली) → दूर देखने में मदद”
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