Lynde, Carleton John, b. 1872 · New York : Macmillan · leaf 274
converge at some point F; and if the incidentrays are parallel, this point F is theprincipal focus of the lens. In Fig. 188 is shown a concave lens made up of sections of prisms. In this case the thinner ends of the sections point towards the center. A ray of light falling on one of these sections… … A concave lens. 26o PHYSICS OF THE HOUSEHOLD Images. — Images are of two kinds, real and virtual.An image is real when the rays which produce it actuallypass through the image. An image is virtual when the rayswhich produce it only appear to pass through the image. A realimage can be produced on a…
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