Two lenses with power + 12 D and -2D are kept in close contact with each other. Find the power of the combination .

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Solution

Given,

Power $P_{1} = + 12 D a n d P_{2} = - 2 D$

Power gets added

$P = P_{1} + P_{2}$

$P = 12 - 2 = 10 D$

Hence, power in combination is $10 D$

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Two lenses with power + 12 D and -2D are kept in close contact with each other. Find the power of the combination .

Given, Power P1=+12D and P2=−2D Power gets added P=P1+P2 P=12−2=10D Hence, power in combination is 10D

Given,

Power $P_{1} = + 12 D a n d P_{2} = - 2 D$

Power gets added

$P = P_{1} + P_{2}$

$P = 12 - 2 = 10 D$

Hence, power in combination is $10 D$