A camera lens is made of glass that has index of refraction 1.6. An antireflective coating is applied to the glass that has index of refraction of 1.4. The coating is designed so that the the reflected light from the front of the glass and the reflected light from the front of the coating destructively interfere for light with a wavelength in vacuum of 650 nm.

Choose the best answer from the options given below:

The coating should be 116 nm thick.

The coating should be 650 nm thick.

Only a material with an index of refraction less than 1.4 would be antireflective.

The coating should be 232 nm thick.