Lumière Flashcards

1
Q

Année lumière

A

Distance parcourue par la lumière dans le vide en une année

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2
Q

i =

A

Angle d’incidence

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3
Q

r =

A

Angle de réflexion

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4
Q

(N) =

A

Normale au point d’incidence (perpendiculaire)

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5
Q

I =

A

Point d’incidence

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6
Q

Loi de Snell-Descartes

A

n1 x sin(i1) = n2 x sin(i2)

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7
Q

Indice de réfraction (n)

A

n = c/v c = célérité de la lumière dans le vide v = vitesse de la lumière dans le matériau ( n est supérieur ou égal à 1)

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8
Q

Une surface lisse est

A

Toujours réfléchissante

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9
Q

Une surface métallique

A

Réfléchit presque totalement la lumière

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10
Q

Loi de wien

A

n| max = k/T

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11
Q

T =

A

Température du corps chauffé en K

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12
Q

K = 2,898.10-3 m.k

A

(Pas forcément à savoir)

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13
Q

Spectroscopie ou spectrométrie

A

Analyse de la lumière : on visualise ou on mesure sa composition en couleur de l’arc en ciel. Le résultat visuel ou mesuré est appelé le spectre de la lumière

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