Question : One can distinguish a telescope from a microscope by observing.
Option 1: length
Option 2: colour
Option 3: size of the glass
Option 4: length and size of the lens
Correct Answer: length and size of the lens
Solution : The correct option is the length and size of the lens .
Telescopes use objective lenses or mirrors to gather and focus light from distant objects. Microscopes use objective lenses to collect light from the specimen and produce a magnified image. Telescopes can have longer tubes to accommodate the focal length needed for observing distant objects.
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