Question

The minimum amount of light energy that must be present for vision is called:

• A. Sensory Ratio
• B. Lumens
• C. Absolute Threshold
• D. Critical Ratio

Hint:

Absolute thresholds are not fixed and can vary depending on conditions like fatigue, environment, or individual differences.

Answer 1

The Correct Option is C

The absolute threshold is the lowest intensity of a stimulus (such as light, sound, or touch) that an organism can detect 50% of the time under ideal conditions.

• Definition: The minimum level of stimulus required for detection.
• Example (Vision): Refers to the dimmest light that can be detected by the human eye.
• Significance: Helps determine the sensitivity of sensory systems.