jarif2007 Asked: September 2023 The radii of curvature of a double convex lens are 30 cm and 20 cm, respectively. If the refractive index of the
jarif2007 Asked: September 2023 (A person uses a concave lens with a focal length of 20 cm as spectacles. What is the power of
jarif2007 Asked: September 2023 How far away from a convex lens at a focal length of 0.75 m should an object be placed to form