A ray of light is incident upon an air/water | vedclass

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(D) When light travels from one medium to another, the following changes occur:$1$. Speed of propagation $(v)$: The speed of light changes because the

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$I, III, IV$ only

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(D) When light travels from one medium to another, the following changes occur:$1$. Speed of propagation $(v)$: The speed of light changes because the refractive index of water is different from that of air $(v = c/n)$.$2$. Wavelength $(\lambda)$: Since $v = f \lambda$ and frequency $(f)$ remains constant while speed $(v)$ changes, the wavelength must change.$3$. Direction of propagation: According to Snell's Law, when light enters a denser medium at an angle of incidence other than $0^o$, it bends towards the normal, changing its direction.$4$. Frequency $(f)$: The frequency of light is a property of the source and does not change when light passes from one medium to another.Therefore, quantities $(I)$, $(III)$, and $(IV)$ change, while $(II)$ remains constant. The correct option is $D$.

$A$ ray of light is incident upon an air/water interface (it passes from air into water) at an angle of $45^o$. Which of the following quantities change as the light enters the water?
$(I)$ wavelength
$(II)$ frequency
$(III)$ speed of propagation
$(IV)$ direction of propagation

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$A$ ray of light is incident upon an air/water interface (it passes from air into water) at an angle of $45^o$. Which of the following quantities change as the light enters the water?$(I)$ wavelength$(II)$ frequency$(III)$ speed of propagation$(IV)$ direction of propagation