physics problem???

Question

when a ray of light enters a glass slab from air,
what happens to it's frequency, wavelength and speed.
please explain to me with your right answer.

you have your options

the wavelength increases
the wavelength decreases
the frequency increases
the speed increases

Answer 1

When light enters glass from air..it faces more resistance from the molecules of glass as compared to molecules of air and so it's velocity decreases

Now frequency is proportional to velocity [n=hc/lambda]
So frequency also decreases However the wavelength of light remains the same
This is because the colour of light depends upon it's wavelength and the colour of light does not change when it emerges from a glass slab....so wavelength must remain the same

Thus when light passes Through a glass slab..it undergoes a lateral shift in direction and gets 'refracted' as its velocity is changed

Hope that answers your question

Answer 2

First, we know that the definition for refractive index n is:

n = c/v

where c is the speed of light in a vacuum, and v is the speed of light in the material with that refractive index.

so, we see that, because glass has a higher refractive index than air, we need to 1) increase c, or 2) decrease v.
well, c is constant, so we see that velocity of a wave must decrease when entering a medium with a higher refractive index, such as air-to-glass.
next, we know that the definition of velocity v is:
v = frequency * wavelength
from this, we see that frequency must remain constant, as otherwise there will be discontinuity between mediums (for example, an ocean wave is always smooth and continuous). So, if velocity decreases, wavelength must decrease as well.
So, thus we see that:

frequency1 = frequency2
wavelength1 < wavelength2
speed1 < speed2

Answer 3

When a ray of light enters a glass slab , it's frequency remains constant , it's wavelength and speed decrease

Answer 4

The frequency stays the same; the speed decreases, and necessarily so does the wavelength. The ratio of the speed in air to the speed in the glass is called the index of refraction, and for glass it is typically about 1.5. But the index of refraction depends somewhat on the frequency of the light (it's called dispersion), so if you are trying to make a nice lens for your camera that does not generate color fringes, you can use several different kinds of glass with different refractions and dispersions so as to contrive that the total dispersion is small.

Answer 5

the frequency of light remains unchanged whatsoever u do. the density of glass slab is greater than that of air so when a ray of light enters a glass slab from air its wavelength decreases and also speed as a result of which it gets deflected.

Answer 6

Velocity=Wavelength x frequency

The Frequency of light remains CONSTANT no matter what the medium is.
Refractive index of glass respect to air>1
so speed in air>1 x speed in glass(by defn of refractive index)
By the above stated formula ,
it follows that Speed decreases when light travels from air to glass.
therefore, Wavelength also decreases.

Answer 7

when a ray of light enters a glass slab from air,it travels from rarer(air) to denser(glass slab) medium.It is the law of refraction that when light travels from rarer to denser medium,it bends towards the normal.Normal is a perpendicular straight line betweeen incident ray and refracted ray.It's wavelength increases as glass has this special property of increasing wavelength.The speed of light is inversely propotional to it's wavelength.More the wavelength,less is speed of light.
-harsh

Answer 8

Frequency remains the same becase there's no accumulation of energy on the interface.

Wavelenth and therefore velocity change.

Going by Snell's Law

sin i /sin r = n2/n1 = v1/v2 = w2/w1

Now refractive index (n2, n1) is also the restriction posed to the velocity of light.
Therefore, velocity in glass slab, v = c/n2

As n2>1, Therefore v Therefore velocity changes, and because frequency is constant, wavelength changes.

Also the phase difference remains the same.

Answer 9

when this accident happens,its frequency remains same, but its wavelength decreses & its speed also decreses cause' glass is denser than air.

Answer 10

its wavelength decreases as glass is denser than air