What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
- Compound microscope
- Galileo's telescope
- Terrestrial telescope
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Astronomical telescope
The correct answer is: D
Explanation
An astronomical telescope traditionally consists of two converging lenses with the objective having a longer focal length than the eyepiece. In this case, the 50 cm lens would serve as the objective, and the 5 cm lens as the eyepiece, which is a standard configuration for astronomical telescopes.
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