Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsOptical instrumentsMedium2 minQB

PhysicsMediummultiple choice

An astronomical telescope and a Galilean telescope use identical objective lenses. They have the same magnification, when both are in normal adjustment. The eyepiece of the astronomical telescope has a focal length $f$ .

Options:(select one or more)

Answer:

B, C

Solution:

Equal magnifying power: $f_{o} / f = f_{o} / f_{g} \Rightarrow f_{g} = f$ .

$L_{astro} = f_{o} + f; L_{gal} = f_{o} - f .$

The lengths differ by $2 f$ , and the Galilean telescope is shorter.

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Optical instruments

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...