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  1. Exams
  2. IIT JEE
  3. Physics
  4. Ray Optics
512 marks

Ray Optics

This chapter deals with the reflection and refraction of light, including mirrors, lenses, prisms, and optical instruments.

9 Topics
45h prep
4% subject weight
9 Topics
1

Reflection and refraction of light at plane and spherical surfaces

2m2/10
๐Ÿ“Œ Key FormulaLaws of reflection, Snell's law nโ‚ sin ฮธโ‚ = nโ‚‚ sin ฮธโ‚‚
2

Mirror formula

2m2/10
๐Ÿ“Œ Key Formula1/f = 1/v + 1/u, f = R/2, with sign convention.
3

Total internal reflection and its applications

2m2/10
๐Ÿ“Œ Key FormulaCritical angle ฮธ_c = sinโปยน(nโ‚‚/nโ‚), nโ‚ > nโ‚‚, applications: optical fiber, mirage.
4

Deviation and Dispersion of light by a prism

2m3/10
๐Ÿ“Œ Key Formulaฮด = i + e - A, for minimum deviation ฮด_m = (ฮผ - 1)A, Dispersion: splitting of light.
5

Lens Formula

2m3/10
๐Ÿ“Œ Key Formula1/f = 1/v - 1/u (using sign convention), lens maker's formula 1/f = (ฮผ - 1)(1/Rโ‚ - 1/Rโ‚‚)
6

Magnification

2m2/10
๐Ÿ“Œ Key Formulam = -v/u (linear), also m = h_i/h_o
7

Power of a Lens

2m1/10
๐Ÿ“Œ Key FormulaP = 1/f (f in meters), unit diopter.
8

Combination of thin lenses in contact

2m2/10
๐Ÿ“Œ Key FormulaP = Pโ‚ + Pโ‚‚ + ..., 1/f = 1/fโ‚ + 1/fโ‚‚ + ...
9

Microscope and Astronomical Telescope (reflecting and refracting ) and their magnifying powers.

2m4/10
๐Ÿ“Œ Key FormulaSimple microscope: M = D/f. Compound microscope: M = (L/fโ‚€)(D/fโ‚‘). Telescope: M = fโ‚€/fโ‚‘.