NIMCET 2015 Computer PYQ — Which optical phenomenon is utilized in the operation of the late… | Mathem Solvex | Mathem Solvex
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NIMCET 2015 — Computer PYQ
NIMCET | Computer | 2015
Which optical phenomenon is utilized in the operation of the latest write- once optical storage medium called digital paper?
Choose the correct answer:
A.
Polarisation
B.
Interference
(Correct Answer)
C.
Internal reflection
D.
Diffraction
Correct Answer:
Interference
Explanation
Explanation:
Digital paper (in the context of write-once optical storage like certain types of optical discs or specialized tape) utilizes the principle of Interference.
Mechanism: These storage media often consist of a thin layer where data is recorded by creating physical changes (like pits or bubbles). When a laser beam hits the surface, the light reflects off both the top surface and the bottom boundary of this thin recording layer.
Constructive and Destructive Interference: The reflected waves from these two surfaces overlap. Depending on the thickness of the layer at that specific spot, the waves will either undergo constructive interference (making it appear bright) or destructive interference (making it appear dark).
Data Retrieval: This change in light intensity (bright vs. dark spots) is read by sensors and translated into binary data (0s and 1s).
Conclusion:
The optical phenomenon utilized is Interference.
The correct option is (b).
Explanation
Explanation:
Digital paper (in the context of write-once optical storage like certain types of optical discs or specialized tape) utilizes the principle of Interference.
Mechanism: These storage media often consist of a thin layer where data is recorded by creating physical changes (like pits or bubbles). When a laser beam hits the surface, the light reflects off both the top surface and the bottom boundary of this thin recording layer.
Constructive and Destructive Interference: The reflected waves from these two surfaces overlap. Depending on the thickness of the layer at that specific spot, the waves will either undergo constructive interference (making it appear bright) or destructive interference (making it appear dark).
Data Retrieval: This change in light intensity (bright vs. dark spots) is read by sensors and translated into binary data (0s and 1s).
