Telescope's angular magnification:

$\overline{){\mathbf{M}}{\mathbf{=}}{\mathbf{-}}\frac{{\mathbf{f}}_{\mathbf{0}}}{{\mathbf{f}}_{\mathbf{e}}}}$

**Part (a)**

f_{0} = R/2 = 2.4/2 = 1.2 m

A small telescope has a concave mirror with a 2.4 m radius of curvature for its objective. Its eyepiece is a 3.2 cm focal length lens.

Part (a) What is the telescope's angular magnification?

Part (b) What angle (in degrees) is subtended by a 25,000 km diameter sunspot? Assume the sun is 1.50×10^{8} km away.

Part (c) what is the image angular size (in degrees) in this telescope?

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