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

Physics & Space Science

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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

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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

Physics & Space Science

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.

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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.

Physics & Space Science