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hoi hoi -_-“

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

By Madelyn

hoi hoi -_-“

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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Madelyn

paraphrase the student requested that the teacher excuse her absence, but the teacher refuse

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