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Exams
IIT JEE
Physics
Wave Optics
4
6 marks
Wave Optics
This chapter covers the wave nature of light, including interference, diffraction, and polarization.
9 Topics
30h prep
2% subject weight
9 Topics
1
Wavefront and Huygens' principle
2m
2/10
📌 Key Formula
Wavefront: locus of points in same phase. Huygens: each point on wavefront acts as secondary source.
2
Laws of reflection and refraction using Huygens principle
2m
3/10
📌 Key Formula
Derivation using wave theory, Snell's law.
3
Interference
2m
2/10
📌 Key Formula
Superposition of waves, constructive and destructive interference.
4
Young's double-slit experiment and expression for fringe width, coherent sources and sustained interference of light
2m
4/10
📌 Key Formula
Fringe width β = λD/d
5
Diffraction due to a single slit, width of central maximum
2m
3/10
📌 Key Formula
Width of central maximum = 2λD/a, condition for minima a sin θ = nλ
6
Resolving power of microscopes and astronomical telescopes
2m
4/10
📌 Key Formula
Microscope: 1/Δx = 2μ sin θ / λ, Telescope: 1/Δθ = D/(1.22λ)
7
Polarization, plane-polarized light
2m
2/10
📌 Key Formula
Light with E field oscillating in one plane, Malus law I = I₀ cos²θ
8
Brewster's law
2m
2/10
📌 Key Formula
μ = tan i_p, where i_p is polarizing angle.
9
Uses of plane-polarized light and Polaroid
2m
1/10
📌 Key Formula
Polaroids as polarizer and analyzer, used in sunglasses, 3D movies.