A magnifying glass of focal length 150. mm is used to examine an old manuscript
(a) What is the maximum magnification given by the lens?
(b) What is the magnification for relaxed eye-viewing (image at infinity)?
(a) 2.67
(b) 1.67
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A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A) -2.4 cm B) 3.4 cm C) 2.6 cm D) -3.4 cm E) 2.4 cm
Twenty milliseconds is 0.020 s
Indicate whether the statement is true or false
In a(n) _____________reaction, one solid ? phase and a liquid phase react to form one solid phase ?.
Fill in the blank(s) with the appropriate word(s).
When two organ pipes each closed at one end sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz. b. 660, 1 320 and 1 980 Hz. c. 880, 1 320 and 1 760 Hz. d. 1 320, 2 640 and 3 960 Hz. e. They have no overtones in common.