Is scope size objective lens diameter ?

Following is a sentence about telescope from

"For example, a small 6-inch (15 centimeter) scope lets you read the writing on a dime from 150 feet (55 meters) away!"

Is 6-inch diameter of objective lens ?

Attached is image of telescope.
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ste5anSenior DeveloperCommented:
No. It is the diameter of the opening (front) of the scope. It is the diameter of the "Objective lens" in your image. In a reflector it would be the diameter of the main mirror at the rear end.
naseeamAuthor Commented:
What is front of scope, eye piece?

"in your image"?  Is that what we are seeing through eyepiece.
ste5anSenior DeveloperCommented:
Sorry, I really assumed my answer was clear: The front is where the light is coming in.

Thus the 6-inch mean the diameter of the  "Objective lens".

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David Johnson, CD, MVPRetiredCommented:
The size of the objective lens determines the amount of light that is allowed to enter (larger means more light means items radiating less light can enter).  There is also the effective magnification power that determines what can be resolved
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Math / Science

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