In a physics lab, light with a wavelength of 490 nm travels in air from a laser to a photocell in a time of 16.6 ns. when a slab of glass with a thickness of 0.800 m is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light a time of 21.0 ns to travel from the laser to the photocell. use 3.00x108 m/s for the speed of light in a vacuum. express your answer using two significant figures. o ? % ac 1 = 280 submit previous

The wavelength of the light in the glass is 182.9 nm.

Explanation:

Given that,

Wavelength = 490 nm

Time = 16.6 ns

Thickness = 0.800 m

Suppose, we need to find the wavelength of the light in the glass.

We need to calculate the distance

Using formula of distance

After slab,

We need to calculate the time to cross air

Using formula of time

Put the value into the formula

So the time in slab is

Put the value into the formula

We need to calculate the speed in slab

Using formula of speed

Put the value into the formula

We need to calculate the wavelength

Using relation of wavelength and speed

Put the value into the formula

Hence, The wavelength of the light in the glass is 182.9 nm.

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