A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
a. Speed is less than when in glass.
b. Speed is less than before it entered glass.
c. Speed is same as that in glass.
d. Speed is same as that before it entered glass.
d
You might also like to view...
Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 ?. When they are connected in parallel, their equivalent resistance is 3.3 ?. What are the resistances of these resistors?
What will be an ideal response?
A scuba diver losing her air supply while far beneath the water surface is advised when ascending to
A) hold air in her lungs. B) allow air to escape her lungs. C) panic.
Some regions along the plane of the Milky Way appear dark because
A) there are no stars in these areas. B) stars in that region are hidden by interstellar gas. C) stars in that region are hidden by dark dust particles. D) many brown dwarfs in those areas absorb light which they turn into heat. E) many black holes absorb all light from those directions.
The period of oscillation for a signal having a frequency of 60 Hz is 60 seconds
Indicate whether the statement is true or false