Your telescope has a 700mm -focal-length objective and a 24mm -focal-length eyep

Question

Your telescope has a 700mm -focal-length objective and a 24mm -focal-length eyepiece. One evening you decide to look at the full moon, which has an angular size of 0.52? when viewed with the naked eye.

PART A:

What angle (in degrees) does the image of the moon subtend, when you look at it through your telescope?

Express your answer using two significant figures.

PART B:

Suppose you decide to take a photograph of the moon using your telescope. You position film so that it captures the image produced by the objective lens. What is the diameter of that image?

Express your answer using two significant figures.

**answer in mm**

Explanation / Answer

Part A:

Angle = 0.52*700/24 = 15.166 degree = 15

Part B:

D = f*Angle = 700*(0.52*?/180) = 6.4 mm

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