Total internal reflection is the complete reflection of a light ray _____.
2 answers:
Answer: (B). Total internal reflection is the complete reflection of a light ray back into its original medium.
Explanation:
Reflection: The reflection will, when the incidence angle will make between and
.
In the reflection, the light ray moves one medium to another medium.
Total internal reflection: The total internal reflection will, when the incidence angle is greater than the critical angle.
In the total reflection, The light ray comes back into the original medium after reflection.
Critical angle: Critical angle permits the ray of light to be reflected back in the medium n₁ and it does not refract into the medium n₂.
Hence, Total internal reflection is the complete reflection of a light ray back into its original medium.
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From the concept of optics on a curvature of a spherical mirror, the proportion for which the focal length is equivalent to half the radius of curvature is fulfilled. Mathematically this is
Here,
f = Focal Length
R = Radius
Rearranging to find the radius we have,
Replacing with our values,
R = 2(13.8cm)
R = 27.6cm
Therefore the radius of the spherical surface from which the mirror was made is 27.6cm