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A image of the sun of formed by a lens of focal-length of 30 cm on the metal surface of a photo-electric cell and a photo-electrci current is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photo-electric current in this case is
  • a)
    I/2
  • b)
    I
  • c)
    2I
  • d)
    4I
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A image of the sun of formed by a lens of focal-length of 30 cm on the...
Lenses of the same diameter collect equal amounts of light.
Intensity is the measure of amount of light collected, hence the intensity remains the same.
Intensity is measured by the photoelectric current. So the photoelectric current would also remain the same.
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Most Upvoted Answer
A image of the sun of formed by a lens of focal-length of 30 cm on the...
Lenses of the same diameter collect equal amounts of light.
Intensity is the measure of amount of light collected, hence the intensity remains the same.
Intensity is measured by the photoelectric current. So the photoelectric current would also remain the same.
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Community Answer
A image of the sun of formed by a lens of focal-length of 30 cm on the...
Diameter on lens remains same. Hence equal diameters will collect same amount of light 
intensity of light will remains the same 
photoelectric current will also remain the same
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A image of the sun of formed by a lens of focal-length of 30 cm on the metal surface of a photo-electric cell and a photo-electrci current is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photo-electric current in this case isa)I/2b)Ic)2Id)4ICorrect answer is option 'B'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A image of the sun of formed by a lens of focal-length of 30 cm on the metal surface of a photo-electric cell and a photo-electrci current is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photo-electric current in this case isa)I/2b)Ic)2Id)4ICorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A image of the sun of formed by a lens of focal-length of 30 cm on the metal surface of a photo-electric cell and a photo-electrci current is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photo-electric current in this case isa)I/2b)Ic)2Id)4ICorrect answer is option 'B'. Can you explain this answer?.
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