Refraction at plane surfaces

Total internal reflection in prisms

Total internal reflection in prisms The problem of providing an untarnishable mirror which gives one image only has been solved in the submarine periscope by using 45° right-angled glass prisms, as shown in Fig. 23.16 (a). Actually a submarine periscope is a combined periscope and telescope, but for simplicity in the diagram the lenses have been omitted. …

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Multiple images formed by a thick glass mirror

Multiple images formed by a thick glass mirror Ordinary mirrors, made by silvering the back face of a sheet of glass, suffer from the disadvantage that extra images are formed by reflection from the front surface of the glass and also by multiple internal reflection inside the glass. Fig. 23.15 shows how the images are formed. Ordinarily …

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To measure the critical angle and refractive index of the material of a prism

To measure the critical angle and refractive index of the material of a prism An equilateral glass prism ABC is placed on a sheet of paper and its outline drawn on the paper with the aid of a ruler in a manner similar to that described for the glass block on page 249. An object pin 0 is then …

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