Openstax College Physics Map dft presented by Sapling Leaming People who do very

Question

Openstax College Physics Map dft presented by Sapling Leaming People who do very detailed work close up, such as jewellers, often can see objects clearly at much closer distance than the normal 25.0 cm. What is the power of the eyes of a woman who can see an object clearly at a distance of only 7.75 cm? Assume a distance from the eye lens to the retina of 2.00 cm. Number 63.8 diopters What is the size of the image of a 1.50 mm object, such as lettering inside a ring, held at this distance? Enter your answer as a pošitive number if the image is upright, and negative if it is inverted. Number 387 nm What would the size of the image be if the object were held at the normal 25.0 cm? Number Incorrect

Explanation / Answer

if the object were held at 25 cm

then  

from lateral magnification m = -s'/s = y'/y

where s', s are the the object distance and image distance  

y,y' are size of object and its image  

-2/25 = y'/0.15

y' = 0.012 cm

y' = 0.12 mm

the size of the image is 0.12 mm

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