True or False? (Please explain! Thank you.) 1)The higher the index of refraction

Question

True or False? (Please explain! Thank you.)

1)The higher the index of refraction of a medium, the slower light moves within it.

2)The index of refraction of most materials depends on the wavelength of the light going through it.

3)In going from air into most materials at the same angle, a blue beam of light deviates more from its original direction than an orange beam.

4)In going from air into most materials at the same angle,  longer wavelength light refracts more than shorter wavelength light.

5)It is possible for a material to have a negative refractive index.

6)Snell’s Law gives the change in intensity of a beam of light when it travels from one medium to another.

7)Dispersion is the phenomenon of different colors having different indices of refraction in a material.

Explanation / Answer

( 1 ) True :

Reafractive index is ratio of speed of light in vaccum to speed in a material. Higher n implies lower speed v

( 2 ) True

In general refractive index varies linearly with wavelength.

( 3 ) True

The white light is disperssed through material in the order smaller ( most deviater first )VIBGYOR. In this case, RED ( R ) is less deviated and violet ( V ) is more deviated. Since refractive index of prism for viloet is greater than red.

( 4)

False:

Longer wavelength light refracts less as compared to shorter wavelength

( 5 )

False

n = c / v

Because, no negative velocites exist.

(6 ) True

Due to different refractive indices different

False:

Snell's law gives angle of refraction as well as indices of materrials only

( 7 )

True:

Due to differnt refractive indicess for differnt colours, dispersion takes place

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