State laws of refraction
Answer
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Laws of Refraction
1. The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
2. The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given color and for the given pair of media. This law is also known as Snell’s law of refraction.
N = sin i/ sin r
This constant is also called the refractive index of the second medium with respect to the first.
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When a light ray strikes a plane mirror at an angle of $15^{\circ}$ with the mirror, what will be the angle through which the ray gets deviated?
\[\begin{align}
& A{{.15}^{\circ }} \\
& B{{.30}^{\circ }} \\
& C{{.75}^{\circ }} \\
& D.\text{none of the above} \\
\end{align}\]
\[\begin{align}
& A{{.15}^{\circ }} \\
& B{{.30}^{\circ }} \\
& C{{.75}^{\circ }} \\
& D.\text{none of the above} \\
\end{align}\]
According to the first law of reflection, which angles will be equal?
A. A=C
B. B=D
C. A=B
D. B=C
A. A=C
B. B=D
C. A=B
D. B=C
Two plane mirrors each of length 10cm are placed at a separation of 1cm. A ray of light is incident at an angle of \[{45^ \circ }\]on one of the mirrors as shown in the figure. How many reflections, the ray have before going out from the other end?
