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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
A person suffering from 'presbyopia' (myopia and hyper metropia both defects) should use
  • A
    A concave lens
  • B
    A convex lens
  • ✓
    A bifocal lens whose lower portion is convex
  • D
    A bifocal lens whose upper portion is convex
✓

Answer

Correct option: C.
A bifocal lens whose lower portion is convex
c
( c)A bifocal lens consist of both convex or concave lenses with lower part is convex.

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