Question

# For a light ray passing from air to water, according to Snell's law: (n represents refractive index of the medium, θair is the angle of incidence and θwater is the angle of refraction)

A
nairsin(θair)=nwatersin(θwater)
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B
nairsin(θwater)=nwatersin(θair)
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C
nairsin(θair)=nwatersin(θwater)=1
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D
nairsin(θwater)=nwatersin(θair)=1
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Solution

## The correct option is A nairsin(θair)=nwatersin(θwater)According to Snell's law, for a light ray travelling from one medium to another, the ratio of sines of angle of incidence to the angle of refraction is a constant. This constant is the refractive index of medium 2 with respect to medium one. nwaternair=sin(θair)sin(θwater ⟹nairsin(θair)=nwatersin(θwater)

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