Help / FAQ
(i) Lens maker's formula is valid for concave lens, convexo-concave
lens and plano-convex or plano- concave lens as well.
(iv) Unlike mirrors where f = r/2, there is no unique relation between f and
R of a lens; for, even if R1 = R2 i.e. bi-convex or bi-concave
Likewise for biconcave lens of R.I. 1.5 only, f = - R. (R is numerical i.e.
positive value only)
Laws of Reflection at plane surfaces
16.3 Laws of Refraction at plane surfaces, Refractive Index and
16.4 Refraction at curved spherical surfaces and
Lens makerís formula
16.6 Refraction in Prisms, Prism Formula
16.7 Dispersion of Light, Angular Dispersion and
16.8 Optical Instruments and Magnifying Power