What must be the minimum value of the index of refraction of the prism shown in Fig. 19.16 a in order that light betotally reflected where indicated? Is the index of refraction of mosttypes of glass greater than this value?

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What must be the minimum value of the index of refraction of the prism shown in Fig. 19.16 a in order that light betotally reflected where indicated? Is the index of refraction of mosttypes of glass greater than this value?

 

(a)
with age, whereas prisms retain their reflective
ability. Finally, prisms can invert an image-that is, make it appear upside
down (Fig. 19.16c). This inversion may seem like a disadvantage. However, the
lenses in optical devices such as telescopes and binoculars cause an object viewed
90°
Deflection
E
(b)
180°
Reflection
(c)
Image
inversion
FIG. 19.16. A
ent ways to chang
rection of light fro
entation of light f
Transcribed Image Text:(a) with age, whereas prisms retain their reflective ability. Finally, prisms can invert an image-that is, make it appear upside down (Fig. 19.16c). This inversion may seem like a disadvantage. However, the lenses in optical devices such as telescopes and binoculars cause an object viewed 90° Deflection E (b) 180° Reflection (c) Image inversion FIG. 19.16. A ent ways to chang rection of light fro entation of light f
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