The Hale reflecting telescope at the Palomar observatory has a parabolic mirror

Question

The Hale reflecting telescope at the Palomar observatory has a parabolic mirror with a 16.8 m focal length and a diameter of 200 in (5.08 m). If a 2.50-cm eyepiece is used, what magnification is achieved? A. 149 B. 672 C. 1210 D. 2410 E. 3240 You pull the finder-scope (which has a magnification of 3.0) off of your telescope to use it as a compound microscope (which has a magnification of 10). If the tube length is 10 cm, what is the focal length of the (finder- scope) objective lens? A. 1.6 cm B. 2.9 cm C. 5.3 cm D. 8.7 cm. E. 16 cm

Explanation / Answer

Hale refelecting telescope

Magnification = focal length of primary lens/ focal length of eye piece

F of lens = 16.8m = 1680 cm

F of eye piece = 2.5 cm

M = 672

compound microscope

M= M1.M2

M1= -L/F0

M2= 25cm/Fe

10= 3.M2

M2= 10/3

3= 10 cm/f0

fo= 10/3 = 3.3 cm

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