The focal length of the lens of a simple digital camera is 40 mm, and it is originally focused on a person 25 m away. In what direction must the lens be moved to change the focus of the camera to a person 4.0 m away?
A) It does not make any difference.
B) sideways from the CCD sensors
C) away from the CCD sensors
D) towards the CCD sensors
C
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If the Sun ceased to generate nuclear fusion in its core, the Sun would immediately begin to collapse inward
a. True b. False Indicate whether the statement is true or false
Resistance and Resistivity: The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the new resistance of this wire?
A. It is 2 times as large. B. It is 4 times as large. C. It is 6 times as large. D. It it 8 times as large. E. It is ½ as large.
A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective
How far apart are the lenses? A) 20 mm B) 21 mm C) 23 mm D) 41 mm
The energy of a photon of wavelength 400 nm is _____________.
a. 
b. 
c. 
d. 
e. 