A negative lens has a focal length of −15 cm. An object is located 21 cm from the lens.?
How far from the lens is the image?
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How far from the lens is the image?
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given u=-21 cm, f=-15 cm and v=?
since 1/f=1/v-1/u => 1/-15=1/v+1/21 => 1/v= -1/15-1/21
=> 1/v= -36/315 => v= -8.75 cm