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in Optics by (48.5k points)
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The optical prescription of a pair of spectacle is 

Right eye: -3.5 D, Left eye: -4.00 D. 

(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?

1 Answer

+1 vote
by (50.8k points)
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Best answer

(i) Shortsighted (Myopia)

(ii) These lenses are thinner in the middle.

(iii) Power = \(\frac{1}{focal\, length}\)

Right eye: 

power P = -3.5 D

Left eye: 

Power P = -4 D

Hence the lens having power of -3.5 D has greater focal length.

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