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Note :

(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 lens

Likewise for biconcave lens of R.I. 1.5 only, f = - R. (R is numerical i.e. positive value only)

Index

Light

16.1 Laws of Reflection at plane surfaces
16.2 Mirrors
16.3 Laws of Refraction at plane surfaces, Refractive Index and Critical Angle

16.4 Refraction at curved spherical surfaces and Lens makerís formula
16.5 Lenses
16.6 Refraction in Prisms, Prism Formula
16.7 Dispersion of Light, Angular Dispersion and Dispersive Power
16.8 Optical Instruments and Magnifying Power

Chapter 17





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