Light is incident along the normal to face ab of a glass prism of refractive index 1.54. find αmax, the largest value the angle α can have without any light being refracted out of the prism at face ac if the prism is immersed in water (with index of refraction 1.33). express your answer in degrees. ignore any reflections from the surface bc.

To solve this problem it is necessary to use the concepts related to Snell's law.

Snell's law establishes that reflection is subject to

Where,

Angle between the normal surface at the point of contact

n = Indices of refraction for corresponding media

The total internal reflection would then be given by

Therefore the would be equal to

Therefore the largest value of the angle α is 30.27°

trig 15.3 cos

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