As you bring a prism close to the angle of total internal reflection, what happens to the angle of the refracted beam outside the prism? what happens to its intensity? what happens to the intensity of the beam inside the prism?

Explanation:

Total Internal Reflection (TIR) occurs when the angle of incident exceeds the value of critical angle and as a result of which the light gets internally reflected and does not refract the light enters at one point and exits at the other like that of an optical fiber.

Critical angle is defined as that incident angle for which the refracted angle is a right angle.

Now, in case a prism is brought close to the angle of TIR, the refracted beam angle increases up to the point where it reaches .

As it exceeds , the beam will be internally reflected without any refraction. So, in reaching the point of TIR, the intensity of the refracted beam decreases and is completely diminished to 0 at critical angle.

The beam intensity inside the prism increases and is maximum at the point of TIR, i.e., at critical angle.

Once TIR is initiated, i.e., the angle exceeds the critical angle, internal reflection occurs with no refracted rays.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.