Distinguish between:
a. Farsightedness and Nearsightedness
b. Concave lens and Convex Lens
rakshyadhungel8:
Concave LensConvex LensAs knownDiverging lensConverging lensShape of the optical surfaceIn concave lens, the centre of the glass piece is thin while the edges are thick.In convex lens, the centre of the glass piece is thick whereas the edges are thin.Polarity of focal lengthNegative, thus sometimes referred as negative lens.Positive, hence another name used for it is positive lens.
Answers
Answered by
8
A.Farsightedness
- It is a refractive error in the lenses of the eye .It causes the light rays to converge behind the retina when sighting near objects
B.Nersightedness
- It is also refractive error in the lenses of eye but it causes the light rays to converge in front of the retina when sighting distant objects
Similar questions