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Q94
(IAS/1994)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Quantitative aptitude topics
Answer Verified
Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure ?
Result
Your answer:
—
·
Correct:
C
Explanation
Exposure is proportional to exposure time divided by the square of the f‑number: E ∝ t / N^2 (so larger time and larger aperture—smaller f‑number—give more exposure). Compute relative exposures (using E = t / N^2): (1) f/22,1/60 ⇒ 1/ (22^2) × 1/60 ≈ 3.45×10^-5; (2) f/16,1/125 ⇒ 1/(16^2) × 1/125 = 3.125×10^-5; (3) f/8,1/250 ⇒ 1/(8^2) × 1/250 = 6.25×10^-5; (4) f/5.6,1/1000 ⇒ 1/(5.6^2) × 1/1000 ≈ 3.19×10^-5. Option 3 (f/8, 1/250) yields the largest numeric exposure, consistent with aperture/shutter tradeoffs described for exposure stops.
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