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Download Metallurgical Microscopy by Helfrid Modin PDF

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By Helfrid Modin

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The light which is not diffracted (the direct beam) is called the Oth maximum. The light where the path difference is one wavelength is designated as the first maximum, etc. , order, some fall on the objective and are focused on the rear focal plane to form images of the light source, the primary interference image, whilst others are confined by the objective mounting. Thus only those rays which have roughly the same phase contribute to such an image of the light source. e. 40). 41 shows lamellar pearlite with the associated primary interference image.

2 THE SPEED OF LENSES The speed of photographic lenses is usually indicated by the f-number, also designated the aperture ratio or the focal ratio, which is obtained by dividing the focal length of the lens by the diameter of the largest parallel light beam which can pass through. If for example the focal length of the lens is 4 cm and the diameter of the parallel light beam which passes through is 1/2 cm, the f-number is 4-i-^ = 8. As a rule a camera lens is provided with a variable diaphragm, by means of which the light-passing power of the lens can be changed.

X is the direction of propagation of the light. e. e. the distance after which the curve repeats edges are reproduced in thefieldof view. This image of the diaphragm should be located centrally and, if not, adjustment will be required. Certain microscopes are provided with adjusting screws for this purpose, whilst on others the adjustment has to be made by an expert. The check on illumination as described above should be made before photography starts. In certain microscopes a mirror is located in the path of the beam during photography.

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