$In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $ \beta $ which of following statements is true???$

In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $\beta$ which of following statements is true???

$\alpha = \beta$

the efractive index of glass is $\frac{sin\theta}{sin\alpha}$

The ray suffers total internal reflection if $\beta$ is greater than the critical angle

the efractive index of glass is $\frac{sin\alpha}{sin\beta}$

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In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $\beta$ which of following statements is true???

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In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is β \beta which of following statements is true???

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In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $\beta$ which of following statements is true???