An object 40 cm high is 30cm from the pinhole c... - JAMB Physics 2022 Question
An object 40 cm high is 30cm from the pinhole camera. If the height of the image formed is 20 cm. What is the distance of the image from the pin height?
A
15 cm
B
70 cm
C
40 cm
D
50 cm
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Correct Option: A
Here's how to solve the problem:
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Understand the principle: The pinhole camera creates similar triangles. The ratio of object height to image height is equal to the ratio of object distance to image distance.
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Set up the proportion: (Object height) / (Image height) = (Object distance) / (Image distance) 40 cm / 20 cm = 30 cm / (Image distance)
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Solve for Image distance: 2 = 30 cm / (Image distance) Image distance = 30 cm / 2 Image distance = 15 cm
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