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Ravu -_-

Ravi is given lenses with powers + 5 D, – 5 D, + 10 D,- 10 D and -20 D. Considering a pair of lenses at a time

By Mary

Ravu -_-

Ravi is given lenses with powers + 5 D, – 5 D, + 10 D,- 10 D and -20 D. Considering a pair of lenses at a time, which two lenses will he select to have a combination of total focal length when two lenses are kept in contact in each case:
i. -10 cm
ii. 20 cm
iii. -20 cm​

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Mary

प्रदूषण को रोकने हेतु कोई पांच उपाय संस्कृत में लिखे।


please give this answer in Sanskrit only​

the concept of the intelligence quotient was divided by? in one word​

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