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3 years ago

At which angle must a laser beam enter the water for no refraction to occur?

1 answer:

5 0

Light that enters the new medium perpendicular to the surface keeps sailing straight through the new medium unrefracted (in the same direction).

Perpendicular to the surface is the "normal" to the surface. So the angle of incidence (angle between the laser and the normal) is zero, and the law of refraction (just like the law of reflection) predicts an angle of zero between the normal and the refracted (or the reflected) beam.

Moral of the story: If you want your laser to keep going in the same direction after it enters the water, or to bounce back in the same direction it came from when it hits the mirror, then shoot it straight on to the surface, perpendicular to it.

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Which of the following changes to the earth-sun system would reduce the magnitude of the force between them to one-fourth the va

Anna35 [415]

Answer:

-Reduce the mass of the earth to one-fourth its normal value.

-Reduce the mass of the sun to one-fourth its normal value.

-Reduce the mass of the earth to one-half its normal value and the mass of the sun to one-half its normal value.

Explanation:

The force (F) between two massive bodies (earth-sun system) is given by the following equation:

$F=\frac{g*M_{e}*M_{s}}{r^{2}}$

Where "g" is the gravitational constant "Me" is Earth's mass, "Ms" is the Sun's mass and "r" is the separation between the Earth and the Sun.

1-) If we reduce the mass of the earth to one-fourth its normal value:

$F^{*} =\frac{g*\frac{M_{e}}{4} *M_{s}}{r^{2}}\\F^{*} =\frac{g*{M_{e}} *M_{s}}{4r^{2}}\\F^{*} =\frac{F}{4}$

2-) Reduce the mass of the sun to one-fourth its normal value.

$F^{*} =\frac{g*\frac{M_{s}}{4} *M_{e}}{r^{2}}\\F^{*} =\frac{g*{M_{s}} *M_{e}}{4r^{2}}\\F^{*} =\frac{F}{4}$

3-) Reduce the mass of the earth to one-half its normal value and the mass of the sun to one-half its normal value.

$F^{*} =\frac{g*\frac{M_{s}}{2}*\frac{M_{e} }{2}}{r^{2}}\\F^{*} =\frac{g*{M_{s}} *M_{e}}{(2*2)r^{2}}\\F^{*} =\frac{F}{4}$

4-) Increase the separation between the earth and the sun to four times its normal value.

$F^{*}=\frac{g*M_{e}*M_{s}}{(4r)^{2}}\\F^{*}=\frac{g*M_{e}*M_{s}}{16r^{2}}\\F^{*}=\frac{F }{16}\\$ .

Therefore, changes 1, 2 and 3 would reduce the magnitude of the force between them to one-fourth of the original value.

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Answer:

The answer is chemical energy

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When you put the iron cube in the olive oil and the brick cube in the water what loses heat more quickly and why? The oil or the

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Answer:

HUH

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Select the correct arrow. Which arrow correctly shows the flow of heat? Reset Next

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If the Big Bang theory is correct, then the universe is billions of years old. And if the Big Bang theory is correct, then the u

garri49 [273]

Answer:

Deductive

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