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Specifically if you increase the diameter of the main lens, or of the main mirror (depending on the type of the telescope), you'll be able to observe dimmer objects (stars, planets, etc.). Also, the telescope's resolving power (angular resolution) improves with a bigger mirror/lens. For example, with a bigger mirror/lens you'll be able to distinguish two stars that are closer together as separate objects.
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As the diameter of the circle increases what happens to the circumference?
The circumference of a circle increases with an increase in the radius as it is directly proportional its radius.
How much more light would a 2-meter-diameter telescope gather compared with one that is 50 cm in diameter?
-48
How do you increase or decrease the radius of a circle?
Increase or decrease the circle's diameter
What is 20 x 70 mm telescope?
20 refers to the amplification, 70 mm to the diameter of the main lens or mirror. Note: This diameter is by far the most important piece of information.
What happens to the circumference of a circle if the diameter doubles?
It quadruples.
