A source of light emits a continuous stream of light energy…

Physics Ray Optics Photometry Single Correct MCQ

Published on: September 13, 2026

A source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as

Luminous energy emitted by the source per second

Luminous flux emitted by source per unit solid angle

Luminous flux falling per unit area of a given surface

Luminous flux coming per unit area of an illuminated surface

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The correct answer is:

Step 1: Understand luminous intensity. Luminous intensity refers to the amount of luminous flux emitted by a source in a specific direction per unit solid angle.
Step 2: Identify the correct definition among the options provided.
Step 3: Analyze each option:

Option A: Defines luminous energy per second, which is not luminous intensity.
Option B: Correct, as it defines luminous flux per unit solid angle.
Option C: Incorrect, as it describes illuminance, not intensity.
Option D: Similar to C, it refers to illuminance.

Therefore, the correct answer is B.

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