Question

Why is it advised to use telescope in a clear sky?

• A. Less interference between telescope and object.
• B. To get better quality of image
• C. To reduce the lateral shift in images caused by the environment
• D. All of the above

Answer 1

The correct option is D All of the above

In a clear sky, images formed by telescope are much sharper because of the following reasons:

1. Atmospheric interference is reduced significantly reduced and only the required object is projected.

2. Since rays don't change much speed on a clear day, image is distortionless and quality is improved.

3. On a clear sky, lateral displacement of object is either negligible or don't change much in small time intervals and this helps in studying the bodies well.