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Two identical thin isosceles prisms of r...

Two identical thin isosceles prisms of refracting angle A and refractive index `mu` are placed with their bases touching each other and this system can collectively act as a crude converging lens. A parallel beam of light is incident on this system as shown in Figure. Find the focal length of this so called converging lens.

Text Solution

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Since `tan delta=(h)/(f) rArr f=(h)/(tan delta)`
Further, `delta =(mu-1)A rArr f=(h)/((mu-1)A)`
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