CUET Preparation Today
An astronomical telescope essentially consists of |
two concave lenses two convex lenses one concave and one convex lens two plano-concave lenses |
two convex lenses |
It consists of two lenses: the objective lens O with a long focal length and a large aperture, and the eyepiece E with a short focal length and a small aperture. The magnification is caused by refraction through these lenses. |
