the image of a object is placed at a distance U=30cm of the same side of lens and image is formed at V=10cm .find the focal lenght
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Answer:
Please mark as brainiest first and the answer is 40.
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Answer:
7.5 cm
Explanation:
(1/v)-(1/u)= (1/f)..... lens equation
put values v=10, u= -30
(1/10)+(1/30)= (1/f)
(3+1)/30=(1/f)
f= 30/4= 7.5cm
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