Why should the objective of a telescope have focal length and large apearture ? Justify your answer .

Explanation

To answer the question of why the objective of a telescope should have a large focal length and a large aperture, we can break it down into two main parts:

### Step 1: Understanding Focal Length
The focal length of a telescope's objective lens or mirror is crucial because it directly affects the magnifying power of the telescope.

- **Magnifying Power**: The magnifying power (M) of a telescope is given by the formula:
\[
M = \frac{f_o}{f_e}
...