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प्रश्न
An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is ______.
पर्याय
- 30 cm
30 cm
- 15 cm
15 cm
MCQ
रिकाम्या जागा भरा
उत्तर
An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is - 15 cm.
Explanation:
When object is placed at 2F, the image formed by concave mirror is also at 2F.
So, 2F = - 30 or F = - 15 cm.
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