- Why does the illuminance of a surface decrease as it moved away from the light source?
- What is the meaning of Luminous intensity?
- Define luminous flux. State its unit of measurement.
- What are the factors on which the illuminance of a surface depends?
- Define luminous efficiency of a source of light and give its SI unit.
- What is the difference between lumen and lux?
- Define illuminance. Name the factor upon which it depends.
- The sun is less bright in morning and in evening as compared to that at noon although its distance from the observer is almost the same. Why?
- Distinguish between illuminance and luminance.
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