\" Afarsighted person uses glasses with a refractive powerof 3.4 diopters. The g

Question

"Afarsighted person uses glasses with a refractive powerof 3.4 diopters. The glasses areworn 2.5 cm from his eyes. Whatis this person's near point when not wearing glasses?"
I understand the progression of the problem (as presented byRobertS in his expert reviewed answer). However, how does one knowthe object distance? I just don't know where the object distance of25cm came from. It is not mentioned in the problem. Any help wouldbe appreciated. Thanks! "Afarsighted person uses glasses with a refractive powerof 3.4 diopters. The glasses areworn 2.5 cm from his eyes. Whatis this person's near point when not wearing glasses?"

Explanation / Answer

Since The least distance of distinct vision for a youngadult with normal vision is about 25 cm So, you take object distance = 25 cm

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