to observe tiny small things
Focus light onto the film
reduce glare and reflections
Magnify images
A telescope can do that, but magnification is not its purpose.
The purpose is that you don't wanna have glasses or you want your eyes to be a different type of color.
Since microscopes are instruments to see and observe very small objects which are not visible to naked eye, it needs to focus on them. The lenses are used for this purpose of focusing. If there will be no lens in the microscope then it will not be able to zoom and focus.
They hold lenses in place, and prevent stray light from entering the field of view.
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You can if you're using Extended contact lenses, these you can use for up to a month I believe as long as you clean them. You could reuse Daily contact lenses, but it's not recommended seeing as they are usually thrown away after their purpose has been served.
Yeah ,for aiming purpose that is for taking target ,but to make gun out of lenses ,it is impossible.
Radial keratotomy is one of several surgical techniques to correct nearsightedness, reducing or eliminating the need for corrective lenses.
He built the telescope because he saw his children play with lenses and he got the idea of making it