Question

Collect at least six convex lenses of different thicknesses and apertures. Find their approximate
focal lengths by making the clear image of a distant object on the wall and then measuring the
distance between the lens and the wall. Select the best pair of lenses for making a refraction type
astronomical telescope. Write the criteria you have kept in mind while making the choice of pair of
lens. Set the telescope for normal adjustment. Select a third lens to make the final image erect.
Find magnifying power and telescopic length in the setting