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Q.

The linear magnification produced by a telescope having an objective of 50cm and eyepiece of 5cm focal length when used to read a scale 3m away is

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a

1.2

b

2

c

0.6

d

4

answer is A.

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Detailed Solution

1f0=1v0−1u0150=1v0−1(−300)⇒v0=60cm;m0=v0u0=0.2m=v0u01+Dfe=0.21+255=0.2×6=1.2

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The linear magnification produced by a telescope having an objective of 50cm and eyepiece of 5cm focal length when used to read a scale 3m away is