Question

1.
2.
3.
4.
Answer (Detailed Solution Below)

Option 4 : 80 / 80

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Detailed Solution

सही उत्तर 80 / 80 है।

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Question:

A flash has a guide number of 40 at ISO 100 (metres). At ISO 400 the effective guide number becomes: / एक फ्लैश का गाइड नंबर ISO 100 पर 40 है (मीटर)। ISO 400 पर प्रभावी गाइड नंबर होगा:

1.
40 / 40
2.
56 / 56
3.
160 / 160
4.
80 / 80

Correct Answer: 80 / 80

Guide number scales with the square root of the ISO ratio: $40 \times \sqrt{400/100} = 40 \times 2 = 80$.

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