A ray of light enters a spherical drop of water of refractive index $μ$ as shown in fig. An expression of the angle between incident ray and emergent ray (angle of deviation) as shown in fig. is :

$0^{\circ}$
$π - 4 α + 2 ϕ$
$α - ϕ$
$ϕ$

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A ray of light enters a spherical drop of water of refractive index μ as shown in fig. An expression of the angle between incident ray and emergent ray (angle of deviation) as shown in fig. is :0∘π−4α+2ϕα−ϕϕ