Last Updated On [03-11-2023]
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 :-
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 |
Next Question :
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A lens is made of flint glass (refractive index = 1.5). When the lens is immersed in a liquid of refractive index 1.25, the focal length |
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a) |
Increase by a factor of 1.25 |
b) |
Increases by a factor of 2.5 |
|
c) |
Increases by a factor of 1.2 |
d) |
Decreases by a factor of 1.2 |
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