Question

the least minimum number of lenses used in a terrestrial telescope is?
options are:
1
2
3
4
5

Answer 1

3.

Objective

Eyepiece

And one lens to invert image formed by objective

Hope it helps!!!

Answer 2

Answer:

The terrestrial telescope generally has three lenses- objective, inverter, and eyepiece. They are all convex lenses and serve different purposes.

The inverter lens is used for inverting an image so that it can be observed using the objective lens. This helps in representing real image orientation and not upside down.