Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsOptical instrumentsEasy2 minPYQ_2020

PhysicsEasysingle choice

Two convex lenses of focal lengths $0.3 m$ and $0.05 m$ are used to make a telescope. The distance kept between the two in order to obtain an image at infinity is

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Answer:

Solution:

When the final image is formed at infinity by a telescope, it is called in normal adjustment and then the length of the telescope is given by

$L = f_{0} + f_{e}$

Where $f_{0}$ is the focal length of objective lens and $f_{e}$ is the focal length of eye-piece

$∴ L = f_{0} + f_{e} = 0.3 + 0.05 = 0.35 m$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Optical instruments

⏱ 2mℹ️ Source: PYQ_2020

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