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An object 15cm high is 30cm from pin-hole camera. If the height of the image...

Physics
JAMB 1982
An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is
  • A. 20cm
  • B. 45cm
  • C. 54cm
  • D. 63cm
  • E. 70cm
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Correct Answer: Option A
Explanation
\(\frac{\text{image height}}{\text{object height}}\) = \(\frac{\text{image distance}}{\text{object distance}}\)

\(\frac{10}{15}\) = \(\frac{\text{image distance}}{30}\)

image distance = 20cm
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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