plz solve this...........it's urgent
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u=-20. v= -40 substitute in the formula e and the answer is f=-60
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1
1 / f = 1 /v + 1/u
1/f = 1 /-40 +(1 / - 20)
1/f = (-1 - 2) / 40
1 / f = - 3/40
f = - 40 / 3 cm.
1/f = 1 /-40 +(1 / - 20)
1/f = (-1 - 2) / 40
1 / f = - 3/40
f = - 40 / 3 cm.
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