Question

how many lens present in terristrial telescope

Answer 1

3

Answer 2

Depends on which telescope you are talking about. They usually have three lenses (+ the eyepiece). "In terrestrial telescopes such as Spotting scopes, monoculars and binoculars, prisms (e.g., Porro prisms), or a relay lens between objective and eyepiece are used to correct the image orientation. There are telescope designs that do not present an inverted image such as the Galilean refractor and the Gregorian reflector. These are referred to as erecting telescopes."

Answer 3

yes i agry 3