People who do very detailed work close up, such as jewellers, often can see obje

Question

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 in D of the eyes of a woman who can sec an object clearly at a distance of only 7.5 cm? Assume distance to her retina from the lens in her eye is 2.00 cm. What is the size in mm of an image of a 1 1 mm object, such us lettering inside a ring, held at this distance? What would the size in mm of the image he if the object were held at the normal 25 cm distance? |h_i, N| = 0.074|

Explanation / Answer

C) image will still form at retina

magnification = 2cm /25 cm as retina is at 2cm

Image size = object size * m

= 1.1*2/25

= 0.088 mm answer

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