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प्रश्न
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is ______.
विकल्प
- 30 cm
- 20 cm
- 40 cm
- 60 cm
MCQ
रिक्त स्थान भरें
उत्तर
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is - 20 cm.
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