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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
Physical processes are sometimes described visually by lines. Only the following can cross.
  • A
    Streamlines in fluid flow
  • B
    Lines of forces in electrostatics
  • ✓
    Rays in geometrical optics
  • D
    Lines of force in magnetism
✓

Answer

Correct option: C.
Rays in geometrical optics
c
$(c)$ Rays can cross-each other while forming image etc.

- Light rays are path of light waves and two waves can cross without effecting each other's characteristics.

- In streamline flow different layers of flowing fluid does not mix with each other. So, streamlines never crosses in entire flow.

- Electric field lines and magnetic field lines never cross as there is only one direction of field at a point in space.

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