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Light Gathering Power
816.3 ×
Light Gathering Power vs Telescope Aperture
सूत्र
## Light Gathering Power **LGP = (D_telescope / D_eye)²** Light collection scales with the area of the aperture. A 200 mm scope collects (200/7)² ≈ 816 times more light than the dark-adapted eye (7 mm pupil). This is why larger telescopes see fainter objects.
हल किया गया उदाहरण
A 200 mm telescope vs 7 mm pupil.
- 01LGP = (200/7)² = 28.57² = 816×
- 02The scope gathers 816 times as much light.
- 03Area = π × (200/20)² = π × 100 = 314 cm²
अक्सर पूछे जाने वाले प्रश्न
Why is aperture the most important telescope spec?
More light means fainter objects, better resolution, and more detail. Aperture is the single most important factor for astronomical performance.
What pupil size should I assume?
Young adults: about 7 mm in darkness. Over 50: about 5-6 mm. This affects the comparison.
Does a larger scope always show more?
In dark skies, yes. Under light pollution, benefits diminish for extended objects but still help for point sources (stars).