Question

A light ray strikes a prism as shown in the figure. The angles of prism are 900

,

450 and 450

. The critical angle of the prism material is 490

.

What rays are the possible continuations of the incident ray?

1) the ray 1 only 2) the ray 2 only 3) the ray 3 only 4) both rays 2 and 3​

Answer 1

Answer:

(iii) the ray three only

Explanation:

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Answer 2

Ray 3 only will be the possible continuations of the incident ray because the incident ray and the emergent ray do not coincide they are parallel to each other. The emergent ray is shifted by some distance from the incident ray while passing throught the glass slab which is called the lateral displacement.

Critical Angle:

• fault-finding angle, in optical organ of an animate being, defeater in competition angle at that a beam of light, cruising in individual see-through medium, can affect the edge betwixt that medium and a second of lower refractive index outside being completely mirrored inside the first medium.
• (The refractive index of a obvious essence is the percentage of the speed of light in a emptiness to allure speed because wealth.) For some angle of occurrence tinier than the detracting angle, and for some angle by any means if the indication strikes the frontier from the opposite, some the beam will pierce the horizon, being bent in the process.
• In physics, complete impression of a beam of light inside a medium to a degree water or cup from the encircling surfaces back into the medium. The wonder happens if the angle of occurrence is higher in amount the restricting angle, named the detracting angle.

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