# ray box questionWatch

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Thread starter 1 year ago
#1
heya bit stuck here and i'm just wondering how wavelength affects the angle of incidence + reflection?
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1 year ago
#2
Wavelength doesn't affect the angle of incidence or reflection.....but the way the waves strike a medium does (or an object).

If it hits 90 degrees (perpendicular) to the reflective object (hence, parallel to the normal line), then the wave will be reflected straight back.

However if it hits a reflective object at an angle, angle of incidence will be same as angle of reflection (This is according to the reflection Law)

But if it hits a medium (say transparent object), the angle of incidence must be greater than critical angle, at which total internal reflection will take place. Again, according to reflection law, angle of incidence will be same as angle of reflection

If it hits 90 degrees (perpendicular) to the medium (hence, parallel to the normal line), then the wave will pass straight through with no reflection.
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Thread starter 1 year ago
#3
(Original post by neluxsan)
Wavelength doesn't affect the angle of incidence or reflection.....but the way the waves strike a medium does (or an object).

If it hits 90 degrees (perpendicular) to the object (hence, parallel to the normal line), then the wave will be reflected straight back.

However if it hits a reflective object at an angle, angle of incidence will be same as angle of reflection (This is according to the reflection Law)

But if it hits a medium (say transparent object), the angle of incidence must be greater than critical angle, at which total internal reflection will take place. Again, according to reflection law, angle of incidence will be same as angle of reflection
i'm doing some question on the ray box experiment and the final question asks me how the angles of incidence and angle of reflection would be affected if red light was used and not blue light- idk if i'm overthinking it.
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1 year ago
#4
Ahh I see, they will be reflected equally, but REFRACTED (totally different topic) differently. Red light will refract less (bend less) than blue light, because (like you said), they have different wavelength (Red light has bigger wavelength than blue light).
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Thread starter 1 year ago
#5
(Original post by neluxsan)
Ahh I see, they will be reflected equally, but REFRACTED (totally different topic) differently. Red light will refract less (bend less) than blue light, because (like you said), they have different wavelength (Red light has bigger wavelength than blue light).
but i'm so confused because it's asking me about reflection- so the results wouldn't be affected?
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1 year ago
#6
(Original post by entertainmyfaith)
but i'm so confused because it's asking me about reflection- so the results wouldn't be affected?
No they won't be due to Reflection Laws. Google Reflection Law, and you might understand better?
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Thread starter 1 year ago
#7
(Original post by neluxsan)
No they won't be due to Reflection Laws. Google Reflection Law, and you might understand better?
thank you
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1 year ago
#8
np
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