The extent of darkness caused due to smoke can be determined by the help of:
Correct answer: B. Ringelmann's charts
- A. Smoke filters
- B. Ringelmann's charts
- C. Horizontal microscopes
- D. All of these
Explanation
Ringelmann's charts compare the apparent darkness or opacity of smoke with standardized shades, allowing smoke density to be estimated visually. They are widely used for checking emissions from chimneys.
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