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I Want to construct a simple(i.e.not costly)telescope,
so,please i want some guidence for that.
How to connect the relation between the diameter of lens and its focal lenth?
- Avinash (age 32)
The diameter of a lens does not affect the focal length, f, which is give by
- where n is the index of refraction of the glass, R1 and R2 are the radii of curvatures of the front and back surfaces and d is the thickness of the lens. The diameter does not enter into this equation. The diameter, D, affects the light gathering power and the resolution.
(published on 09/23/11)
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