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Geometrical Optics Formulae for NEET

  1. Laws of Reflection of lightReflection of light
    • The incident ray, the refracted ray, and normal lie on the same plane
    • Snells law

    sin i/sin r = constant

  2. Relative refractive index 1n2 = v1/v2

    v1 = velocity of light in first medium

    v2 = velocity of light in second medium

  3. Absolute Refractive indexn = c/v

    c= velocity of light in air

    v = velocity of light in given medium

  4. Lateral ShiftLateral Shift

    Lateral shift

  5. Normal shift on a single surfaceNormal shift Ns= t[1-1/n]
  6. Relation between refractive index and critical anglen = 1/sin C
  7. Refraction through a prismRefraction through a prism

    Refractive index of the prism n = [sin(A+δ/2)]/sin A/2

  8. Deviation produced by a thin filmd = (n-1) A

    (n-1) is called the refractivity of the material

  9. Angular dispersion between two coloursAngular dispersion = (nv-nr)A

    nv, nr is the refractive index of violet light and red light

  10. Dispersive powerω = nv– nr/n-1
  11. Lens makers formula for thin lenses1/f = (n-1) { 1/R1 – 1/R2}
  12. Power of lensP = 1/f
  13. Equivalent focal length of combination of two thin lenses1/f = 1/f1 + 1/f2

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