Question

Candela is the unit of:

• A. Luminous flux
• B. Luminous intensity
• C. Light
• D. Brightness

Hint:

The candela (cd) is the SI unit of luminous intensity, which measures the visible light emitted in a particular direction.

Answer 1

The Correct Option is B

Step 1: Understanding Candela (cd) The candela (cd) is the SI unit of luminous intensity, representing the amount of light emitted by a source in a particular direction. 
Step 2: Differentiating Related Terms 
- Luminous flux (lumen, lm): Measures the total visible light output from a source. 
- Luminous intensity (candela, cd): Measures the light emitted per unit solid angle in a specific direction. 
- Light: A general term, not a specific unit. 
- Brightness: A subjective measure of perceived light, not an SI unit. 
Step 3: Evaluating options: 
- (A) Incorrect: Luminous flux is measured in lumens (lm), not candela. 
- (B) Correct: Luminous intensity is measured in candela (cd). 
- (C) Incorrect: Light is a general term, not a physical unit. 
- (D) Incorrect: Brightness is a subjective perception, not an SI unit.