By Helfrid Modin
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24). 25). 26. 24. 25. 26. 27. 28. Difference offocus for light of different wavelengths with different types of objective (from : Cook, Microscopes) having a suitable refractive index and suitable dispersion (Figure 227). When correcting a microscope objective every effort is made to obtain the same image distance for different colour images produced by the objective, otherwise the final image will be sharp for only one colour, whilst more or less out of focus for the remaining colours. Since the aperture on the image side is relatively large for the inter mediate image produced by the objective, the circles of confusion will be relatively large even with a slight deviation in image spacing.
The angular magnification then becomes : a At small angles one can say that the angle = the tangent of the angle and one then gets : /? 4 The principal plane The lens equations are valid for infinitely-thin lenses. In fact, lenses always possess a certain thickness and that point in the lens from which the focal length is calculated is then no longer located in the centre plane of the lens. The plane in which an infinitely thin lens should be located in relation to the focus is designated as the principal plane and both of the focal points in one lens have their own principal plane.
The reflectivity of the front face of the glass is slightly increased. For this reason this side is now usually given a reflection treatment, whilst the back face is given an antireflection treatment so as to prevent double contours in the image. The plane glass may also cause an astigmatic error in the entire field of view unless the path of the beam through it is parallel, which can only occur at infinite tube length. If the rays are not parallel, the glass must be so thin that the astigmatic error is not noticeable.