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# physics: (1) which diffracts more, blue light or red light?

### Resolved Question:

physics: (1) which diffracts more, blue light or red light? (2) which refracts more, blue light or red light
Submitted: 5 years ago.
Category: Homework
Expert:  David replied 5 years ago.

David :

red light diffracts more then blue
blue refract more than red

Customer:

David :

(1) recall the formula dsin(theta) =n*lambda

David :

hence the larger labmbda corresponds to the larger diffraction angle

David :

since red light has larger wavelength the diffraction angle is greater

David :

(2) blue light propagates slower in the media, hence it bends more than the red light.

David :

hope this explanation helps

Customer:

(1) is OK, but need a different explanation for (2)

David :

on values are dependent upon the frequency of light.v=c/n,
for blue light n is larger and hence the speed of the blue light is smaller.
It is this difference in n value for the varying wavelengths
that causes the dispersion of light by a triangular prizm.
Violet light, being slowed down to a greater extent by the
absorption and reemission process, hence it refracts more than red light.

David :

hope this helps