A lens is made with focal length -40 cm using a material with index of refraction 1.50. A second lens is made with the same geometry as the first but using a higher index material, the index being 2.00
What is the focal length of the second lens? A)
-40 cm
B)
-80 cm
C)
-53 cm
D)
-20 cm
E)
-30 cm
D
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Two lights are 1000 ns apart along a stretch of railway track. In the ground frame, the west light flashes 600 ns before the east light flashes. Could these flashes be simultaneous in the frame of a train moving along the track at a certain speed (that is less than the speed of light)?
A. Yes, if the train is moving east at the correct speed. B. Yes, if the train is moving west at the correct speed. C. Yes, if the train observer happens to be at the right distances from the lights when receiving their flashes. D. No, the flashes cannot be simultaneous in any frame.
Solids that are good conductors of heat tend also to be good conductors of electricity
Indicate whether the statement is true or false
A concave mirror has a focal length F. An object that is placed in front of the mirror has an image that
A. can be upright or inverted. B. is always upright. C. is always inverted. D. depends on the magnitude of F.
Radiation Pressure: Except for their color, a perfectly black (absorbing) object is identical to a perfectly white (reflecting) object. If identical light falls on both of these objects, what is true about the momentum they will receive from this light?
A. The black object will receive twice as much as the white object. B. They will both receive the same amount. C. The white object will receive twice as much as the black object. D. The black object will receive four times as much as the white object. E. The white object will receive four times as much as the black object.