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NEET 2012 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2012

The magnifying power of a telescope is . When it is adjusted for parallel rays the distance between the objective and eyepiece is . The focal length of lenses are

Answer: (4)

Solution

For a telescope in normal adjustment (final image at infinity, i.e. for parallel rays) the lens separation is and the magnifying power is . So $ =

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Question ID VK-091268