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# Refraction in mediums, need something clarified!

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1. Here is a visual representation of what I need explained:
http://prntscr.com/awciwd

So basically if the refractive index of the glass block decreases, the medium becomes less optically dense allowing light to travel faster, so the displacement "d" decreases right? If d decreases does that mean the light ray bends more away from the normal?

Also using a smaller wavelength, say blue light perhaps which has a smaller wavelength than red therefore travelling slower; in the case of using a smaller wavelength does the light ray bend more towards the normal? As I know that displacement "d" will increase using a smaller wavelength.

If the red light travels faster than blue light in the medium does it bend more towards the normal or away?

Thanks in advance and sorry if the wording is a bit confusing!
2. (Original post by 1017bsquad)
Here is a visual representation of what I need explained:
http://prntscr.com/awciwd

So basically if the refractive index of the glass block decreases, the medium becomes less optically dense allowing light to travel faster, so the displacement "d" decreases right? If d decreases does that mean the light ray bends more away from the normal?

Also using a smaller wavelength, say blue light perhaps which has a smaller wavelength than red therefore travelling slower; in the case of using a smaller wavelength does the light ray bend more towards the normal? As I know that displacement "d" will increase using a smaller wavelength.

If the red light travels faster than blue light in the medium does it bend more towards the normal or away?

Thanks in advance and sorry if the wording is a bit confusing!

I agree with your explanations and result.

So basically if the refractive index of the glass block decreases, the medium becomes less optically dense allowing light to travel faster, so the displacement "d" decreases right?

Yes.

If d decreases does that mean the light ray bends more away from the normal?

Yes.

....in the case of using a smaller wavelength does the light ray bend more towards the normal?

Yes.

If the red light travels faster than blue light in the medium does it bend more towards the normal or away?

Bends towards to the normal. The bending of towards the normal is not very large - usually less than 5 degrees.
3. (Original post by Eimmanuel)
I agree with your explanations and result.

So basically if the refractive index of the glass block decreases, the medium becomes less optically dense allowing light to travel faster, so the displacement "d" decreases right?

Yes.

If d decreases does that mean the light ray bends more away from the normal?

Yes.

....in the case of using a smaller wavelength does the light ray bend more towards the normal?

Yes.

If the red light travels faster than blue light in the medium does it bend more towards the normal or away?

Bends towards to the normal. The bending of towards the normal is not very large - usually less than 5 degrees.
Thank you very much, I appreciate it!

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