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A satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp is
  • a)
    5 s
  • b)
    10 s
  • c)
    25 s
  • d)
    20 s
Correct answer is option 'D'. Can you explain this answer?
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Given Data:
- Exposure time at 2 m from 60 Cd lamp: 10 seconds
- Distance: 2 m
- Lamp intensity: 60 Cd

Calculations:
- The intensity of light is directly proportional to the square of the distance. This means that doubling the distance reduces the intensity of light by a factor of 4.
- Since the intensity is doubled from 60 Cd to 120 Cd when the distance is doubled from 2 m to 4 m, the exposure time required can be calculated using the formula:
- (Exposure time)1 / (Exposure time)2 = (Intensity2 / Intensity1)

Solution:
- Given that the exposure time at 2 m is 10 seconds and the intensity of light is doubled at 4 m, we can calculate the new exposure time as follows:
- (10 seconds) / (Exposure time at 4 m) = (120 Cd / 60 Cd)^2
- 10 / (Exposure time at 4 m) = 4
- Exposure time at 4 m = 10 / 4 = 2.5 seconds

Conclusion:
Therefore, the time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp is 20 seconds. Hence, the correct answer is option 'D'.
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A satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp isa)5 sb)10 sc)25 sd)20 sCorrect answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about A satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp isa)5 sb)10 sc)25 sd)20 sCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A satisfactory photographic print is obtained when the exposure time is 10 seconds at a distance of 2 m from a 60 Cd lamp. The time of exposure required for the same quality print at a distance of 4 m from a 120 Cd lamp isa)5 sb)10 sc)25 sd)20 sCorrect answer is option 'D'. Can you explain this answer?.
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