Always match the extinguisher type with the fire class for effective suppression and safety.
Types of fire extinguishers:
• Water Extinguishers: Use water to extinguish Class A fires (wood, paper).
• Foam Extinguishers: Use foam for Class A and B fires (flammable liquids).
• CO2 Extinguishers: Use carbon dioxide for Class B and electrical fires.
• Dry Powder Extinguishers: Use dry chemicals for Class A, B, and C fires (metal, liquid, gas).
• Wet Chemical Extinguishers: Use wet chemicals for Class K fires (cooking oils).
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |