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JAMB Physics 2017 Paper

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Question : 16

Total: 49

Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high

10 cm
16 cm
5 cm
14 cm

Solution:

Magnification = $\frac{\text{Length of camera}}{\text{distance of object from pin hole}}$

m =

\frac{12}{60}

= 0.2

Also magnification m =

\frac{\text{Height of image}}{\text{Height of object}}

∴ Height of image = m × height of object

= 0.2 × 70

= 14cm

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