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Some currency notes (to avoid counterfel...

Some currency notes (to avoid counterfelts) change their colour as you till them. This is due to

A

Diffraction

B

Polarization

C

Interference

D

Refraction

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding why some currency notes change color when tilted, we can break down the explanation into clear steps. ### Step-by-Step Solution: 1. **Understanding the Phenomenon**: - When you tilt a currency note, you observe a change in color. This is a visual effect that occurs due to the interaction of light with the surface of the note. 2. **Light Interaction**: - The surface of the currency note is designed in such a way that it can reflect light in different ways depending on the angle at which the light hits it. 3. **Interference of Light**: - The change in color is primarily due to the phenomenon of interference. When light waves reflect off the surface of the note, they can interfere with each other. This interference can be constructive or destructive, depending on the path difference between the light waves. 4. **Path Difference**: - As the angle of incidence changes when you tilt the note, the path difference between the reflected light waves changes. This results in different colors being visible at different angles. 5. **Conclusion**: - Therefore, the change in color of the currency notes when tilted is due to the interference of light waves reflecting off the surface of the note, which creates a pattern of colors that vary with the angle of observation. ### Final Answer: The change in color of currency notes when tilted is due to the interference of light waves reflecting off the surface of the note. ---
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