Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is
a)
4.5 D
b)
18 D
c)
45 D
d)
9 D
Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is
a)
4.5 D
b)
18 D
c)
45 D
d)
9 D
Question ID - 152379 | SaraNextGen Top Answer
Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is
a)
4.5 D
b)
18 D
c)
45 D
d)
9 D
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Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is |
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|
a) |
4.5 D |
b) |
18 D |
c) |
45 D |
d) |
9 D |
1 Answer
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