Diffraction of blue and red light on a prism

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Discussion Overview

The discussion revolves around the behavior of blue and red light as they pass through a prism, specifically focusing on the path of the emergent ray for blue light in relation to its refraction and potential total internal reflection. The scope includes concepts of refraction, critical angles, and the dependence of refractive indices on wavelength.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the path of the emergent ray for blue light, questioning whether it will move towards or away from the normal, or if total internal reflection will occur.
  • Another participant asserts that the angle of incidence for blue light may be too large for it to pass through the prism's face.
  • A third participant notes that the refractive index and critical angle for blue light are dependent on its wavelength.
  • A suggestion is made to change the term 'diffraction' in the thread title to 'refraction' to better reflect the phenomena being discussed.

Areas of Agreement / Disagreement

Participants express differing views on the behavior of blue light in the prism, with no consensus reached regarding the path of the emergent ray or the appropriateness of the term 'diffraction.'

Contextual Notes

The discussion includes assumptions about the angles of incidence and the definitions of critical angles, which may vary based on the specific conditions of light and the prism material.

khondowe
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Could someone help me with the path taken by the emergent ray for blue light if it is refracted most than red light rays.the emergent ray for the red light lies on the boundary of the prism after being diffracted and forms the criticle angle(c). Is the path taken by the refracted blue light ray going to towards the normal,away or there's going to be total internal refraction?
 

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Its angle of incidence is too large for it to pass through that face.
 
Note that the refractive index itself, and hence the critical angle for blue, depends on the wavelength of blue light.
 
May I suggest that the term 'diffraction' in the title of the post be changed to 'refraction'.
 

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