Question

The optical prescription of a pair of spectacles is right eye : -3.5D left eye :-4D
i) Name the defect of the eye
ii) Are these lenses thinner at the middle or at the edges
iii) which lens has a greater focal length

Answer 1

Answer:

• then both of the lenses are concave
• both are thinner at middle
• the left eye are weaker and left eyes are more defective
• hope it helps you