CHAPTER AT A GLANCE
1. Reflection of light : If is the turning back of light in the same medium.
2. Laws of reflection :
(i) Incident ray, reflected ray and normal all three lie in the same plane.
(ii) Angle of incidence Li = angle of reflection Lr
3. Spherical mirror: For radius of curvature R, the focal length of spherical mirror will be f = R/2 . For convex mirror it is + f and for concave mirror it is -f.
11. Dispersion produced by prism : It is splitting of white light into its seven constituents colours.
12. The refractive index of material of a prism depends on wavelength of light. It approximately is given by Cauchy’s equation as:
14. Combination of prisms mean deviation or w
(i) Dispersion without deviation :
(ii) Deviation with dispersion :
For two small angled prisms, we have
21. Combined focal length
23. Compound microscope
24. Astronomical telescope
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