Linear Light Sources

Q

Q

Q

W

I

N

P

Isin

q

q

S

1

f

f

2

W

: length of source

I

: luminous intensity per unit length

of source

q

: angle between PQ and normal of face

b

: angle between PQ and linear source

r : distance between P and Q

r

d

: reflectance of face

b

l

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