Two lenses, one diverging of power 2 diopyre and the other converging of power `6 dioptre` are combined together. Calculate focal length and power of the combination.

Two lenses, one diverging of power 2 diopyre and the other converging

1.	Two lenses, one diverging of power 2 diopyre and the other converging of power `6 dioptre` are combined together. Calculate focal length and power of the combination.
Answer» Correct Answer - 25 cm, 4 D Here, `P_1 = -2 D P_1 = + 6 D` Power of combination, `P = P_1 + P_2 = -2 + 6 = 4 D` `F = (100)/(P) = (100)/(4) = 25 cm`.

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Two lenses, one diverging of power 2 diopyre and the other converging of power `6 dioptre` are combined together. Calculate focal length and power of the combination.

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