Question

In the working idea of a telescope's magnifying power, the beam of incident rays is inclined at an angle \[\alpha\] with the principal axis, while the emergent beam is inclined at a greater angle \[\beta\]. This produces:

Options

• Linear magnification

• Chromatic dispersion

• Angular magnification

• Resolving power

Answer 1

The beam of incident rays is inclined at an angle $\alpha$ with the principal axis, and the emergent beam is inclined at a greater angle $\beta$ with the principal axis. Since $\beta > \alpha$, this produces angular magnification, which is the basis of the telescope's magnifying power.