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3 years ago

What is the refractive index of a medium?

Physics

2 answers:

Travka [436]3 years ago

7 0

The refractive index is the speed of light in a vacuum over the speed of light in the medium.

The answer is B. the ratio of the velocity of light in a vacuum over the velocity of light in the medium

Verdich [7]3 years ago

4 0

Answer: Option B: the ratio of the velocity of light in a vacuum over the velocity of light in the medium, n = c/v

Explanation:

When a wave of light enters in some materials, the velocity changes depending on the material, and this is why some times when light enters in something, for example, a glass of water, the "path" of the light changes (and you can see some cool visual effects)

then, we define the refractive index of a medium as:

n = c/v

where n is the refractive index, c is the velocity of the light in the vacuum and v is the velocity of the light in the material, here you can see that n is always greater or equal than 1 ( in the case n = 1, we also have v= c)

Then, the correct option is:

option B: the ratio of the velocity of light in a vacuum over the velocity of light in the medium

You might be interested in

What is waters characteristic shape due to

Serga [27]

<h2>Answer: polar covalent bonding</h2>

In polar covalent bonding, electrons are shared <u>unequally </u>between atoms, due to the unequal distribution of electrons between atoms of different elements, slightly positive and slightly negative charges appear in different parts of the molecule.

In this context, water molecule is an exellent example of this type of bonding:

Water ( $H_{2}O$ ) can stick to itself through hydrogen bonds, because a water molecule consists of 2 hydrogen atoms attached to 1 oxygen atom.

The oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Then, it can be said that a water molecule will have a negative side (oxygen) and a positive side (hydrogen).

Thanks to this polarity, water molecules can stick together with the formation of hydrogen bonds to attract a partial positive charge of hydrogen and a more electronegative atom, such as oxygen.

5 0

3 years ago

A ping-pong ball is traveling at 10m/s in air, spinning 100 revolutions per second in the clockwise direction. Calculate the lif

allsm [11]

Answer:

lift force = 0.213 N

Drag force = $2*10^-3 N$

Explanation:

Given: velocity v = 10 m/s

w = 100 rev/sec

diameter d = 3cm

density D = 1.2kg/m3

lift force = $16/3*(pi^2*d^3*w*D*v)$

Substituting the values into the equation, we obtain

lift force = 0.213 N

Drag force = C*D*A*v/2

where C = 0.5

substituting the values into the equation again, we have

Drag force = $2*10^-3 N$

5 0

3 years ago

Observations of the Crab Nebula taken over several decades show that gas blobs that are now 100 arcseconds from the center of th

Oksi-84 [34.3K]

Answer:

Estimation: year 1110.

Explanation:

We need to know how much time it takes to move 100 arcseconds if it moves at 0.11 arcsecond per year. Similarly to any velocity equation $v=\frac{d}{t}$ , where in our case the distances are angular, we will obtain the time by doing: