Physics
Advanced optical sensors in air-to-air missiles use fiber optic cables to transmit light signals with minimal loss. This relies on a physical phenomenon that confines light within the fibers, making the system very dependable for guiding the missile precisely.
(a) Name the optical phenomenon that allows light signals to remain confined within the fiber optic cables during transmission.
(b) Explain the two main conditions necessary for this phenomenon to occur.
Related Questions
The diagram given below shows a copper wire wound around a U-shape soft iron bar. An iron pin is brought near the arrangement. First Source P and then Source Q are connected across AB, each operating independently.
(a) State True or False: Source P as well as Source Q, when connected across AB, can attract the iron pin.
(b) Justify your answer to (a) with a suitable reason.
(a) Name the radiations that are emitted during the decay of a nucleus, which has highest penetrating power?
(b) Does the emission of the above-mentioned radiation result in a change in the mass number?
The diagram below shows a fish in the tank and its image seen in the surface of water.
(a) Name the phenomenon responsible for the formation of this image.
(b) A double convex lens with refractive index μ1 inside two liquids of refractive indices μ2 and μ3 are shown in the diagrams below. The refractive indices are such that μ2 > μ1 and μ1 > μ3
How would a parallel incident beam of light refract when it comes out of the lens in each of the cases shown above?
(1) in figure a.
(2) in figure b.
A scientist lowers a metallic ruler vertically into a transparent oil tank. The ruler touches an object placed at the bottom of the tank and gets wet up to the 25 cm mark. If the refractive index of the glycerin is 1.25:
(a) up to which mark will the ruler get wet, if the scientist lowers it up to the image of the object?
(b) how will this length in (a) change if another liquid of μ > 1.25 is used?