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दो लेंस जिनकी शक्तियां 4D और -2D है, संपर्क में रखे है! संयुक्त लेंस की शक्ति होगी-

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दो लेंस जिनकी शक्तियां 4D और -2D है, संपर्क में रखे है! संयुक्त लेंस की शक्ति होगी-
A. 6D
B. 2D
C. `-2`D
D. `4D`
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1 Answer

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Correct Answer - B
2D
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