Understanding EM Wave Reflection: Wavelength Changes Explained

[engnrshyckh]

Homework Statement

1) The wavelength of an electromagnetic wave after reflection at angle on a surface

[A]. remains same as the wavelength perpendicular to the surface
[B].
remains same in the free space @
[C]. increases in actual direction of propagation
[D]. decreases in actual direction of propagation
2)

Relevant Equations

C=f*lambda

Problem Statement: 1) The wavelength of an electromagnetic wave after reflection at angle on a surface

[A]. remains same as the wavelength perpendicular to the surface
.
remains same in the free space @
[C]. increases in actual direction of propagation
[D]. decreases in actual direction of propagation
2)
Relevant Equations: C=f*lambda

Problem Statement: 1) The wavelength of an electromagnetic wave after reflection at angle on a surface

[A]. remains same as the wavelength perpendicular to the surface
.
remains same in the free space @
[C]. increases in actual direction of propagation
[D]. decreases in actual direction of propagation
2)
Relevant Equations: C=f*lambda

As we know the frequency of of em waves will not change so wave length alsom must nt be change so the right ans must be B but some sorces says option is C but they give no explanation why c is correct

 

[phinds]

some sorces [SIC] says option is C but they give no explanation why c is correct

Possibilities
1) They were talking about refraction, not reflection, and you misunderstood what they were saying
2) They don't know what they are talking about

And by the way "some sources say ... " is not a valid citation for this forum. WHO says that? Where did they say it?