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Spot the one that does not belong

Exercise and reference answers

Questions
  1. Items
    1. Diamond's sparkle
    2. Mirage
    3. Rainbow
    Odd item
    Rainbow
  2. Items
    1. Snell's law
    2. Mirror equation
    3. Thin lens formula
    Odd item
    Snell's law
  3. Items
    1. Dioptre
    2. Metre
    3. Power
    Odd item
    Metre
  4. Items
    1. Objective
    2. Eyepiece
    3. Critical angle
    Odd item
    Critical angle

Explanation

Each group is one summary point. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.
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