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प्रश्न
To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be
(1) a tree
(2) a building
(3) a window
(4) the sun
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उत्तर
(4) the sun
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
