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Q.

A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 20cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is __________mm.

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answer is 150.

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Detailed Solution

When object is at infinity

u=∞,μ1=1,R=15cmV=?,μ2=1.5−μ1u+μ2v=μ2−μ1R⇒−1∞+1.5v=1.5−125               1.5v=0.525

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A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 20cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is __________mm.