Question

an object is placed in front of concave mirror of radius of curvature 40 centimetre at a distance of 10 centimetre find the position ,nature and magnification of image.

Answer 1

Reflecting telescopes use mirrors instead of lenses to collect light. Because mirrors have only one reflective surface, they are easier to construct than lenses, which are made from optical glass, and cannot have any occlusions because light must pass completely through them. In addition, mirrors have less spherical aberration, which is a scattering of light that occurs when lenses don't perfectly focus on a single point. Mirrors also reflect all wavelengths of light equally, whereas lenses bend light differently depending on its wavelength.