Explanation
A microscope consists of lens of small focal lengths. A telescope consists of objective lens of large focal length.
A simple microscope is just a convex lens with object lying between optical centre and focus of the lens.
Cross wire arrangement is used to make measurements.
Radio, waves can pass through dust, clouds, fog, etc. in a radio, telescope, It can detect very faint radio signal due to enormous size of its reflector, So, it can be used at night and even in cloudy weather.
Because size of the aperture decreases.
For greater aperture of lens, light passing through lens is more an so intensity of image increases.
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