A light ray passes from water to glass. How does the speed of light change?

increases

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decreases

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remains same

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none of these.

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Solution

The correct option is B decreases
We know that, $V_{g l a s s} μ_{g l a s s} = V_{w a t e r} μ_{w a t e r}$
We also know that, $μ_{g l a s s} = 1.48, μ_{w a t e r} = 4 / 3 = 1.33$
$V_{g l a s s} = \frac{1.33}{1.48} V_{w a t e r} = 0.9 V_{w a t e r}$
Therefore, speed of light will decrease.

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A light ray passes from water to glass. How does the speed of light change?

The correct option is B decreasesWe know that, Vglassμglass=VwaterμwaterWe also know that, μglass=1.48, μwater=4/3=1.33Vglass=1.331.48Vwater=0.9VwaterTherefore, speed of light will decrease.

The correct option is B decreases
We know that, $V_{g l a s s} μ_{g l a s s} = V_{w a t e r} μ_{w a t e r}$
We also know that, $μ_{g l a s s} = 1.48, μ_{w a t e r} = 4 / 3 = 1.33$
$V_{g l a s s} = \frac{1.33}{1.48} V_{w a t e r} = 0.9 V_{w a t e r}$
Therefore, speed of light will decrease.