Which of the following is used to increase the range of a telescope?a)Increasing the focal lengthb)Decreasing the focal lengthc)Increasing the diameter of the objectived)Decreasing the diameter of the objectiveCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Increasing the diameter of the objective is used to increase the range of a telescope.

Explanation:
Increasing the focal length:

- The focal length is the distance between the lens (or mirror) and the point where incoming parallel rays converge.
- Increasing the focal length of a telescope does not increase its range.
- It only affects the magnification of the telescope, making the image appear larger but not increasing its ability to gather light or resolve detail.

Decreasing the focal length:

- Similarly, decreasing the focal length does not increase the range of a telescope.
- It may increase the field of view, allowing a wider area to be observed, but it does not improve the ability to see distant objects.

Increasing the diameter of the objective:

- The objective is the main lens or mirror of the telescope that gathers and focuses light to create an image.
- Increasing the diameter of the objective lens or mirror increases the amount of light that can be gathered.
- More light means a brighter image and the ability to see fainter objects.
- This increase in light-gathering power directly improves the range of the telescope.
- With a larger objective, a telescope can gather more light from distant objects, allowing them to be seen more clearly and in greater detail.

Decreasing the diameter of the objective:

- Decreasing the diameter of the objective reduces the light-gathering power of the telescope.
- This reduces the range and ability to see faint objects.
- A smaller objective also decreases the resolution of the telescope, making it harder to distinguish fine details.

In conclusion, increasing the diameter of the objective is the correct option to increase the range of a telescope.

Answer

The light-gathering power of the objective will increase and even faint objects will become visible. This is done by increasing the diameter of the objective. So, by increasing the diameter of the objective, the range of the telescope can be increased.

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