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
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lakkarajuyatin:
why did you multiply v by10 mm
first i converted cm into mm thats why i multiplied it by 10
v is negative and m =-v/u
so -(-v) should be plus
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