Where must an object be placed with respect to a converging lens of focal length 30 cm if the image is to be virtual, and three times as large as the object?
What will be an ideal response?
20 cm from the lens
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Neutron stars must ____
a. rotate very rapidly b. be very luminous c. have weak magnetic fields d. have a mass greater than three solar masses e. have about the same surface temperature as the star that created them
Which of the following indicates the presence of high-mass stars in a region of recent star formation?
A) closely spaced low-mass stars B) ionization nebulae C) globular clusters D) planetary nebulae
A particle (charge = 40 ?C) moves directly toward a second particle (charge = 80 ?C) which is held in a fixed position. At an instant when the distance between the two particles is 2.0 m, the kinetic energy of the moving particle is 16 J. Determine the distance separating the two particles when the moving particle is momentarily stopped.
A. 0.75 m B. 0.84 m C. 0.95 m D. 0.68 m E. 0.56 m
What is the minimum thickness of a nonreflecting film coating (n = 1.30 ) on a glass lens (n = 1.50 ) for wavelength 500 nm?
A) 250 nm B) 221 nm C) 192 nm D) 167 nm E) 96.2 nm