1.People who do very detailed work close up, such as jewellers, often can see ob

Question

1.People who do very detailed work close up, such as jewellers, often can see objects clearly at much closer distance than the normal 25 cm. What is the power of the eyes of a woman who can see an object clearly at a distance of only 7.50 cm? Assume that the distance from the cornea to the retina is 2.0 cm

I got 63.3 D

2. What is the size of an image of a 0.70 mm object, such as lettering inside a ring, held at this distance

I got -0.187

3. What would the size of the image be if the object were held at the normal 25 cm distance? I cannot figure this one out

Explanation / Answer

3.

For do = 25 cm

as di = 2 cm

Using lens formula ,

1/f = 1/25 + 1/2

f = 1.85 cm

Now,

size of image , hi = -di*ho/do

hi = -2*0.70/25

hi = -0.056 mm

the size of the image is -0.056 mm

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