Draw a labelled ray diagram of an image formed by a refracting telescope with final image formed at infinity. Derive an expression for its magnifying power with the final image at infinity

Explanation

### Step-by-Step Solution:

1. **Understanding the Telescope Configuration**:
A refracting telescope consists of two lenses: the objective lens and the eyepiece (ocular lens). The objective lens forms a real, inverted image of a distant object, and the eyepiece magnifies this image for the observer.

2. **Ray Diagram**:
- Draw the objective lens (convex lens) and label it as \( O \).
- Draw the eyepiece lens (also a convex lens) and label it as \( E \).
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