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Why do we have in a camera a 镜头) instead ofa simple hole ? The reason can be seen from the figures (图像). In Figure 1, the hole is small . Rays of light from apoint ( P 1) outside reach a very small part of the wallopposite , and we see there a small point . But whenthe hole is bigger , as in...

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Why do we have in a camera a 镜头)instead ofa simple hole?

The reason can be seen from the figures(图像).

In Figure 1, the hole is smallRays of light from apoint (P1)outside reach a very small part of the walloppositeand we see there a small pointBut whenthe hole is biggeras in Figure 2, rays from thepoint(P2)can cover a larger part of the wall oppositeand we don't see a clear pointRays fromother points(Qoutside can also fall on the same place insideTherefore the picture is not clearwhen the hole is big and it is not bright when the hole is small because very very little light canpass through it.We can get better result with a . If the is made in the shape shown inFigure 3, all the rays of light from the point(P3) are thrown on point(P'insideThe picturewhich we seethereforeis clearand it is also bright because more light can pass through a than through a small hole.

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