A lens with a focal length of 20 cm has what power?
a. 5.0 diopters
b. 0.2 diopters
c. 2 diopters
d. –5.0 diopters
e. 0.02 diopters
a
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An object increases in mass if it is moving rapidly compared to the observer
Indicate whether the statement is true or false
The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air, how long does it take the football to reach the top of its trajectory?
A) 1.0 s B) 2.0 s C) 3.0 s D) 4.0 s E) 5.0 s
An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is
A) real and upright. B) real and inverted. C) virtual and upright. D) virtual and inverted.
The bending of light because of a speed change as it moves from one medium to another is called
a. diffraction. b. refraction. c. reflection. d. the Doppler effect.