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3 years ago

Which statement explains why astigmatism causes objects to appear blurry?

2 answers:

8 0

In the defect of "Astigmatism" eye cannot focus on common point, so the light rays get deflected. Here, the lens has two different focal points.

In short, option C is your final answer.

Hope this helps!

Elis [28]3 years ago

4 0

'C' is a simple explanation of astigmatism.

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Which statement correctly compares sound and light waves?

vitfil [10]

Light travels as transverse waves and can go through the vacuum of space, while sound has longitude waves and needs to travel through something solid. It can’t travel through a vacuum of space like light.

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3 years ago

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Calculate the force which will produce an extension of 0.30mm in a steel wire with a length of 4.0m and a cross section area of

Anna [14]

Given data:

* The extension of the steel wire is 0.3 mm.

* The length of the wire is 4 m.

* The area of cross section of wire is,

$A=2\times10^{-6}m^2$

* The young modulus of the steel is,

$Y=2.1\times10^{11}\text{ Pa}$

Solution:

The young modulus of the steel in terms of the force and extension is,

$Y=\frac{F\times l}{A\times dl}$

where F is the force acting on the steel wire,, l is the original length of the wire, dl is the extension of the wire, and A is the area,

Substituting the known values,

$\begin{gathered} 2.1\times10^{11}=\frac{F\times4}{2\times10^{-6}\times0.3\times10^{-3}} \\ F=0.315\times10^2\text{ N} \\ F=31.5\text{ N} \end{gathered}$

Thus, the force which produce the extension of 0.3 mm of the steel wire is 31.5 N.

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11 months ago

John enjoys watching crime shows and his best subject in school was chemistry. What might be a good career for him to explore? I

Vera_Pavlovna [14]

The answer is D forensic investigator

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3 years ago

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A spring with a spring constant of 1730 N/m is compressed 0.136 m from its equilibrium position with an object having a mass of

Elan Coil [88]

Given :

A spring with a spring constant of 1730 N/m is compressed 0.136 m from its equilibrium position with an object having a mass of 1.72 kg.

To Find :

The embankment in the height.

Solution :

Since no external force is acting in the system, therefore total energy will be conserved.

Initial kinetic energy of the object = Energy stored in spring

$K.E _i = \dfrac{kx^2}{2}\\\\K.E_i = \dfrac{1730\times 0.136^2}{2}\\\\K.E_i = 16\ J$

Also, initial potential energy is 0.

Now,

$K.E_i + P.E_i = K.E_f + P.E_f\\\\16 + 0 = \dfrac{1.72\times 2.45^2}{2}+ mgh\\\\mgh =16 - 5.16\\\\h = \dfrac{16 - 5.16}{1.72 \times 9.8}\\\\h = 0.64\ m$

Therefore, the embankment height is 0.64 m.

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3 years ago

This is a picture of an argon laser. Electrified argon causes the green glow. Where did the argon come from? A. water B. an ore

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2 years ago

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