A person struggles to read by holding a book at arm's length, a distance of 49...
A person struggles to read by holding a book at arm's length, a distance of 49 cm away.
What power of reading glasses should be prescribed for her, assuming they will be placed 1.9 cm from the eye and she wants to read at the "normal" near point of 25 cm ?
Express your answer using two significant figures.
** HELP ME UNDERSTAND THIS PLEASE
why do I make di negative when solving ? how did I know the image
was virtual. PLEASE break it down for me. thank you
Homework Answers
object distance from the lens,
do = 49 - 1.9
= 47.1 cm
image distance from the lens,
di = -(25 - 1.9)
= -23.1 cm
image distance is negative. Because, it is virtual(image is formed in the same side as object)
now use,
1/f = 1/do + 1/di
1/f = 1/47.1 + 1/(-23.1)
f = -45.3 cm (or) -0.453 m
power of the lens, P = 1/f
= 1/(-0.453)
= -2.2 D <<<<<<<<--------------Answer
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A person struggles to read by holding a book at arm's length, a
distance of 49...
A person struggles to read by holding a book at arm's length, a distance of 49...
A person struggles to read by holding a book at arm's length, a distance of 49 cm away. What power of reading glasses should be prescribed for her, assuming they will be placed 2.1 cm from the eye and she wants to read at the "normal" near point of 25 cm ?
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