Calculate the distance at which an object should be placed infront of a concave lens of focal length 30 cm to obtain an image of half of its size.

Calculate the distance at which an object should be placed infront of

1.	Calculate the distance at which an object should be placed infront of a concave lens of focal length 30 cm to obtain an image of half of its size.
Answer» Calculate the DISTANCE at which an object should be placed infront of a CONCAVE lens of focal length 30 cm to obtain an image of half of its size.f1 = 25 cm = 0.25 mp1 = 1/f1 = 1/0.25 = 4Df2 = -10 cm = -0.1mp2 = 1/f2 = 1/-0.1 = -10D(a) Power of the COMBINATION:P = p1 + p2= 4D + (-10D)= - 6 D(b) Focal length of the combination:F = 1/P = 1/-6 = -0.1666m = -16.66cm(c) The combination has negative focal length, so it is diverging.

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Calculate the distance at which an object should be placed infront of a concave lens of focal length 30 cm to obtain an image of half of its size.​

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Calculate the distance at which an object should be placed infront of a concave lens of focal length 30 cm to obtain an image of half of its size.