a refracting telescope has an eyepiece lens and objective lens
objective lens coverges rays of light to form a real image at the focal point of objective lens the light from real image enters eyepiece lens which spreads rays out so they leave at a wider angleand fill more of your retrina making image look magnified.
incident ray parallel to axis will pass tgrough focal point when its reflected.
incident ray passing thrrough focal point will be parallel to axis when its reflected.
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