The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively
An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope?
A) -470 x B) -190 x C) -240 x D) -320 x E) -300 x
E
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A given individual is unable to see objects clearly when they are beyond 100 cm. What focal length lens should be used to correct this problem?
a. ?100 cm b. ?33.3 cm c. ?20 cm d. 75 cm e. 100 cm
David stands 2.5 meters in front of a plane mirror
(a) How far from David is David's image in the mirror? (b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other? (c) If David is 180. cm tall, how tall is his image in the mirror?
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
a. 4.1 cm b. 2.9 cm c. 3.4 cm d. 5.1 cm e. 2.4 cm
A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave
Indicate whether the statement is true or false