for which does the -2.5D power lens is used
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concave lens is the answer
marrilikith:
not correct
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-2.5D refers to lens which can't see far object clearly but they can see near object clearly.In this light can't focus of retina, causing faraway objects to appear blurry. It causes eye strain or squinting and sometime headache.
thanks but i want an perfect answer please
this was not an biology question this is an ps question so dont talk rubbish
ok
The focal length of the person is 40cms. A person who cannot see beyond 40cm can use lens having power of -2.5D. The person has myopia and therefore have to use concave lenses. Hope this helped:)
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