In calculating the lateral magnification from a lens, a negative result means
A)
the image is larger than the object.
B)
the image is smaller than the object.
C)
the image is directed downward.
D)
the image is inverted.
E)
the calculation is incorrect.
D
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A) Ptolemy B) Hipparchos C) Copernicus D) Aristarchus E) Pythagoras
The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the free-fall acceleration at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2)
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A single slit of width a is illuminated by light of wavelength ?. If a = 4.3?, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
A. 2. B. 4. C. 6. D. 8. E. 9.