find the focal length and nature of lens which should be placed in contact with a concave lens of focal length 25 cm from a real image five times the size of the object placed 20cm from the combination

find the focal length and nature of lens which should be placed in con

1.	find the focal length and nature of lens which should be placed in contact with a concave lens of focal length 25 cm from a real image five times the size of the object placed 20cm from the combination
Answer» 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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find the focal length and nature of lens which should be placed in contact with a concave lens of focal length 25 cm from a real image five times the size of the object placed 20cm from the combination​

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find the focal length and nature of lens which should be placed in contact with a concave lens of focal length 25 cm from a real image five times the size of the object placed 20cm from the combination