Question
1.
2.
3.
4.
Answer (Detailed Solution Below)
Option 3 : f/16
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Detailed Solution
सही उत्तर f/16 है।
Key Points
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prepsnap.in • Part -AQuestion:
At 1:1 magnification a lens set to f/8 has an effective aperture of approximately _____ / 1:1 आवर्धन पर f/8 पर सेट लेंस का प्रभावी अपर्चर लगभग _____ होता है।
1.
f/8
2.
f/11
3.
f/16
4.
f/22
Correct Answer: f/16
Effective aperture grows with magnification: $N_{eff} = N(1 + m)$. At 1:1 with the lens set to f/8, $N_{eff} = 8 \times 2 = 16$, i.e. f/16. This is why macro exposures need far more light than the set f-number suggests.
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