The Advance of Photography Its History And Modern Applications
The Advance of Photography Its History And Modern Applications
A E Albert Edward Garrett
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in. And vi. Are often called meniscus lenses. The class A are all thicker at the centre than at the edges, and parallel rays of light falling upon one side of any of these will converge on the other side towards a point on their axes, hence these are called converging lenses. The Class B are all thinner at the centre than at the edge, and parallel rays falling on these will diverge on the other side, hence these are known as diverging lenses. In order to understand some of the difficulties whic...h beset the pioneers in the manufacture of photographic lenses, it will be necessary to deal in a little more detail LENSES 109 I n m IV B v Fig. 32. VI 110 THE ADVANCE OF PHOTOGRAPHY with the manner in which the rays of light are affected when made to pass through a simple thick lens. Spherical Aberration. We have assumed that when rays of light are parallel and pass through a converging lens they all come to a focus at one point on the principal axis of the lens ; such is very far from being the case A o Fig.
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