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प्रश्न
A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by ______.
पर्याय
15
20
30
0
MCQ
रिकाम्या जागा भरा
उत्तर
A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by 0.
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