<span>The correct answer is B - Light can travel in a vacuum, and its speed is constant if the source is moving or stationary.</span>
False, the term seeing is not used to describe the measure of faint an object can be detected.
<u>Explanation:</u>
Astronomers use the term "seeing" to suggest the effect of turbulence created by atmosphere. As per telescopes, the larger the area of telescope, the more accurately it can detect fainter objects. This is because the area of telescope is directly proportional to the light collected in it.
Thus, the term seeing and ability to observe fainter object is completely independent of each other. So, it is a false statement that the term seeing is used to describe how faint an object can be detected by a telescope.
Answer:
Given:
refractive index of core,
refractive index of clad,
Explanation:
Critical angle can be defined as the incidence angle which results in the refraction angle being equal to at that angle of incidence.
For Total Internal Reflection to occur, the incidence angle must be greater than the critical angle.
Now, we know that the critical angle, is given by:
Now, for :
Now the force of gravity pulling down the slope is greater than frictional force. At this point the runaway has bern friction compesated. This means that the gravitational force acting to pull the trolley fowards is opposed by frictional force acting against the moving object