The telescopes in which lenses are used are called?
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refracting telescope.... .. .
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reflecting telescope, instead of a convex objective lens, a concave mirror is used to collect parallel rays from the object and form an image at the focal point. Then the convex eyepiece lens is used to magnify this image for the viewer
holaanswer:
but he said only which lens
hey it's convex lens
yes convex i said
ok
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