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.
