If the index of refraction of a medium is 1.4, determine the speed of light in that medium.
4.2 x 108m/s
2.1 x 108m/s
4.7 x 10-9m/s
4.7 x 108m/s

The refractive index of a medium can be calculated by the use of the angle of incidence and angle of refraction, or the speed of light in air and the speed of light in the medium

The speed of light in air is 3×10⁸m/s.

then n= (speed of light in a air)/(speed of light in the medium.)

1.4=(3ₓ10⁸)/(speed of light in the medium)

speed of light in the medium=3ₓ10⁸m/s÷1.4= 2.1×10⁸m/s

=2.1×10⁸m/s

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )