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9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
In dispersion without deviation
  • A
    The emergent rays of all the colours are parallel to the incident ray
  • ✓
    Yellow coloured ray is parallel to the incident ray
  • C
    Only red coloured ray is parallel to the incident ray
  • D
    All the rays are parallel, but not parallel to the incident ray
✓

Answer

Correct option: B.
Yellow coloured ray is parallel to the incident ray
b
( b)Deviation is zero only for a particular colour, it is generally taken to be yellow.

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