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JAMB Physics 2016 Paper

Question : 6

Total: 48

Solution:

Concept:

For a pinhole camera, magnification is the ratio of image distance to object distance.

Explanation:

Let the object distance be

u

and the image distance be

v

The linear magnification is

m = \frac{v}{u}

So, image size is inversely proportional to the object distance

u

u

is reduced by half,

u

becomes

\frac{u}{2}

Then,

m = \frac{v}{u/2} = 2\left(\frac{v}{u}\right)

Thus, the image size is doubled.

Answer:

Is double

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