The sum of focal lengths of the two lenses of a refracting telescope is 105 cm. The focal length of one lens is 20 times that of the other. Determine the total magnification of the telescope when the final image is formed at infinity.

Explanation

To solve the problem step by step, we can follow these instructions:

### Step 1: Define the variables
Let:
- \( f_O \) = focal length of the objective lens
- \( f_E \) = focal length of the eyepiece lens

### Step 2: Set up the equations
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