Relation between illumination on inclined surface and angle

Q.  According to second law of illumination, the illumination at any point on an inclined surface is
- Published on 04 Sep 15

a. Directly proportional to the cosine of the angle between the normal to the surface at that point
b. Directly proportional to the sin of the angle between the normal to the surface at that point
c. Directly proportional to the tan of the angle between the normal to the surface at that point
d. Directly proportional to the cot of the angle between the normal to the surface at that point

ANSWER: Directly proportional to the cosine of the angle between the normal to the surface at that point

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