You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which of the two lenses would you use for the objective?
A)
Lens A, because it has the shorter focal length.
B)
Lens B, because it has the longer focal length.
C)
It makes no difference which lens I use for the objective.
D)
None, because the objective should be a diverging lens.
A
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A) zero. B) 5 J. C) 10 J. D) more than 10 J. E) need more information.
What causes X-ray bursters?
A) The binary companion of a neutron star spirals in and combines with the neutron star. B) The mass of an accreting neutron star passes a critical threshold between 2 and 3 Msun and explodes. C) Helium fusion, which occurs when the thin layer of accreted material on a neutron star reaches 100 million K D) The rapid rotation of the neutron star causes it to fly apart.
What is the angle of incidence on an air-to-glass boundary if the angle of refraction in the glass (n = 1.60) is 25°?
a. 40° c. 43° b. 25° d. 16°
Which will win the race to the bottom of the incline: a hoop, or a disk with the same mass and radius?
A. the hoop B. the disk C. they will both reach the bottom at the same time