Optics Question 509

Question: Light from a point source falls on a small area placed perpendicular to the incident light. If the area is rotated about the incident light by an angle of 60o, by what fraction will the illuminance change

Options:

A) It will be doubled

B) It will be halved

C) It will not change

D) It will become one-fourth

Show Answer

Answer:

Correct Answer: C

Solution:

Rotation of area about incident light doesn’t change the inclination of the light ray on the area.



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