The aperture of the objective lens of a telescope is made large so as to

Options

A. Increase the magnifying power of the telescope
B. Increase the resolving power of the telescope
C. Make image aberration less
D. Focus on distant objects

Answer

To solve the question regarding the effect of increasing the aperture of the objective lens of a telescope, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Aperture**: The aperture of a telescope refers to the diameter of its objective lens. A larger aperture allows more light to enter the telescope.

2. **Effects of a Larger Aperture**:
- A larger aperture increases the amount of light captured, which can improve the brightness of the image.
- It also affects the telescope's resolving power, which is the ability to distinguish between two closely spaced objects.

3. **Resolving Power Formula**: The resolving power (R) of a telescope is given by the formula:
\[ R = \frac{D}{1.22 \lambda} \]
where:
- \(D\) is the diameter of the aperture,
- \(\lambda\) is the wavelength of light being used.

4. **Analyzing the Formula**:
- From the formula, we can see that resolving power is directly proportional to the diameter \(D\). Therefore, increasing the diameter (making the aperture larger) will increase the resolving power.

5. **Conclusion**: The primary reason for making the aperture of the objective lens larger is to increase the resolving power of the telescope. This allows for better clarity and detail when observing distant objects.

### Final Answer:
The aperture of the objective lens of a telescope is made large so as to **increase the resolving power**.

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