The illuminance illuminated by the same source at different points on – McqOptions

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1.	The illuminance illuminated by the same source at different points on the horizontal surface varies with the light rays inclined at an angle θ on the vertical axis?
A.	1/cos θ
B.	cos3 θ
C.	Cos2 θ
D.	Cos θ
Answer» C. Cos2 θ

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