Question
a.
in astronomical telescope, the rays from the object after refraction at the objective are brought to a focus before entering the eyepiece to produce a real inverted image in front of the eye piece
b.
in Galileo's telescope, the rays from the object get refracted at the objective and are intercepted by the eyepiece before a real image is formed
c.
a line passing through the optical centre of the objective traversing through the eyepiece, is called line of sight
d.
all the above.
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