Q38P - University Physics with Modern Physics

Question

In a physics lab, light with wavelength  travels in air from a laser to a photocell in  When a slab of glass  thick is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light  to travel from the laser to the photocell. What is the wavelength of the light in the glass?

Step-by-Step Solution

Answer

  the wavelength of the light in the glass is 196nm

Step 1: About wavelength of light

Wavelength of the Visible Light ranges between 400 nm to 700 nm and here we come to know the wavelength of various colours of the visible spectrum of light.

Step 2: The wavelength of the light in the glass

The light is travelling in 17 ns when no glass slab is inserted- After inserting a glass slab it takes 212 ns to travel from origin to

destination. Means light requires extra 42 ns time to pass the glass slab- We can Write the time difference-

Step 3: Determine the wavelength of light

Now the Wavelength of the light in the medium having index of refraction n will be:

 

Therefore   the wavelength of the light in the glass is 196nm