A narrow beam of light passes through a slab obliquely and is then received by an eye (figure 18-Q1). The index of refraction of the material in the slab fluctuates slowly with time. How will it appear to the eye? The twinkling of stars has a similar explanation.
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Explanation:
- When the refraction index increases μ the refracted rays in the slab change their course.
- That means they emerge at different points from the slab.
- It results in the change of the source picture and the eye discovers that the source disappears/shifts a little over time, and the source appears twinkling like a star.
Refractive index:- Refractive index, furthermore called refraction index, measures the bending of a ray of light as it travels from one medium to another. ... Furthermore, the refractive index is equal to the speed of light c of a given wavelength in empty space separated into a material by its velocity v, or n = c/v
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