Test Index

JAMB Physics 2014 Paper

Question : 24

Total: 41

Solution:

Concept:

In a pinhole camera, linear magnification equals the image distance divided by the object distance.

Explanation:

The image distance is the length of the camera, which is

25\,\text{cm}

The object distance is given as

10\,\text{m}

. Convert it to centimetres:

10\,\text{m} = 1000\,\text{cm}

Now apply the magnification formula:

\text{Magnification} = \frac{\text{image distance}}{\text{object distance}} = \frac{25}{1000}.

Simplify:

\frac{25}{1000} = 0.025 = 2.5 \times 10^{-2}.

Answer:

The linear magnification is

2.5 \times 10^{-2}

This corresponds to option B.

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