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3 years ago

What is meant by the term total internal reflection? What two conditions must be met for total internal reflection to occur?

Physics

1 answer:

Alex17521 [72]3 years ago

5 0

Answer:

Hello....

Explanation:

Total internal reflection, in physics, complete reflection of a ray of light within a medium such as water or glass from the surrounding surfaces back into the medium. The phenomenon occurs if the angle of incidence is greater than a certain limiting angle, called the critical angle.

The conditions required for total internal reflection (TIR) to occur are:

1)the light must be travelling from a more dense medium into a less dense medium (ie glass to air)

2)the angle of incidence must be greater than the critical angle.

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3 years ago

A ball is projected upward at time t = 0.0 s, from a point on a roof 20 m above the ground. The ball rises, then falls and strik

enot [183]

Answer:

$9.8\ m/s^2$

Explanation:

Given:

x = initial vertical height of the ball = 20 m
y = final height of the ball = 0 m
a = acceleration of the ball in air = $-g = -9.8\ m/s^2$
u = initial vertical velocity of the ball = 37.9 m/s

Assume:

t = time interval

When an object is in air, the gravitational force due to earth in the downward direction and air resistance opposite to the motion of the object acts on it. But, air resistance is neglected unless it is mentioned in the question. This means only gravitational force due to the earth acts on it in the downward direction.

Let us first find out the time interval for which the ball remains in the air i.e., the time instant from which the ball was projected vertically up to the time instant at which the ball strikes the ground.

Since the ball in the air remains at constant acceleration motion, we have the following relation:

$y-x = ut+\dfrac{1}{2}at^2\\\Rightarrow 0-20=37.9t+\dfrac{1}{2}(-9.8)t^2\\\Rightarrow 4.9t^2-37.9t-20=0\\$

On solving the above quadratic equation, we have

t = -0.50 s or t = 8.23 s

Since t = -0.50 s is the time in the past. So, it is wrong and t = 8.23 s is the desirable time instant.

This means the ball is in the air for 8.23 s. Since the ball in the air remains in constant acceleration motion in the downward direction. So, the ball has a constant acceleration closest to $9.8\ m/s^2$ at t = 6.2 s. This is because the ball remains in the air for 8.23 s.

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3 years ago

Why does the temperature increase as we go underground?

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3 years ago

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Alenkasestr [34]

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3 years ago

A scooter has a mass of 250. Kg. A constant force is exerted on it for 60.0 S. during the time the force is exerted, the scooter

kodGreya [7K]

Answer:

Explanation:

change in momentum = m ( v - u ) ; m is mass , V is final velocity and u is initial velocity .

= 250 ( 28 - 6 )

= 5500. N.s

for calculating magnitude of force we shall apply the concept of impulse

Impulse = F X t = m( v-u ) ; F is force applied for time t .

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3 years ago