By Hermann Wollnik
Educational Press, 1987. Paperback. e-book situation no longer Used
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Extra info for Optics of Charged Particles
Sample text
The first lens that it encounters is the object glass. Its function is to produce a real image in its focal plane, and the distance between the object glass and this 10 primary image is f1, the focal length of the object glass. In a real bird-watching telescope, the object glass in reality is a crown-flint achromatic doublet that brings all colours to almost the same focus. In a large astronomical telescope, instead of a lens, the primary image is formed by a large concave mirror that is often paraboloidal rather than spherical in shape.
This is not a sign “convention”; it is just a statement of fact, or an explanation of what are meant by “real object”, virtual object”, “real image” or “virtual image”. 50. 00). 33). A converging beam of light is incident upon the lens directed toward a virtual object O that is 60 cm from the lens. After refraction through the lens, the light converges to a real image I that is 20 cm from the lens. I am not at this stage going to ask you to calculate the radii of curvature of the lens. ) I just want to use this diagram to define what I mean by convergence.
One is parallel to the axis, and, after passing through the lens, it passes through the focus on the other side of the lens. The other goes through the centre of the lens. ) Parallel rays emerge from the lens. The eye is immediately to the right of the lens, and it easily brings the parallel rays to a focus on the retina. Although the lens does not actually produce an image, it is sometimes said that the lens produces “a virtual image at infinity”. The angular size of this virtual image is α, which is also the angular size of the object, namely α = h/f.
