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sweet [91]
3 years ago
8

If a farsighted person has a near point that is 0.600 m from the eye, what is the focal length f2 of the contact lenses that the

person would need to be able to read a book held at 0.350 m from the person's eyes?
Physics
1 answer:
ra1l [238]3 years ago
7 0

Answer:

f = 0.84 m

Explanation:

given,

near point of the distance from eye(d_i) = 0.60 m

distance he can read (d_o)= 0.350 m

focal length of the contact lens = ?

now,

Using lens formula

\dfrac{1}{f} = \dfrac{1}{d_0} + \dfrac{1}{d_i}

\dfrac{1}{f} = \dfrac{1}{0.35} + \dfrac{1}{-0.6}

\dfrac{1}{f} = 1.19

f = \dfrac{1}{1.19}

f = 0.84 m

Hence, The focal length of the contact lens that person needed is equal to

f = 0.84 m

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Explanation:

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Two large, parallel, nonconducting sheets of positive charge face each other. What is at points (a) to the left of the sheets, (
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Answer:

a)The electric Field will be zero at the point between the sheets

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c)E_2=\dfrac{\sigma}{\epsilon_0}

Explanation:

Let \sigma be the surface charge density of the of the non conducting parallel sheet.Let consider a Gaussian surface in the form of of cylinder such that its cross-sectional is A . Then there will be flux only due to cross sectional area as the curved sectional is perpendicular to the the electric field  so the Electric Flux due to it is zero.

Now using Gauss law we have, E be the electric Field at the distance r from the sheet then

E\times 2A=\dfrac{\sigma A}{\epsilon_0}\\E=\dfrac{\sigma}{2\epsilon_0}

The Field will be away from the sheet and perpendicular to it.

a) The Electric Field between them

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b)The Electric Field to the right of the sheets

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c)The Electric Field to the left of the sheets

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The atomic mass of an element is defined as the weighted average mass of that element’s
marishachu [46]

Answer:

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It is equivalent to one twelfth of the mass of the nucleus of the most abundant isotope of carbon, carbon-12. It corresponds roughly to the mass of a proton (or a hydrogen atom). It is abbreviated as "uma", although it can also be found by its English acronym "amu" (Atomic Mass Unit). However, the recommended symbol is simply "u".

<u> The atomic masses of the chemical elements are usually calculated with the weighted average of the masses of the different isotopes of each element taking into account the relative abundance of each of them</u>, which explains the non-correspondence between the atomic mass in umas, of an element, and the number of nucleons that harbors the nucleus of its most common isotope.

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Mrrafil [7]
You can calculate potential energy by:
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Hope this helps!
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3 years ago
Read 2 more answers
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