What is an infectious disease? a. a disease such as cancer or heart disease that is not transmitted from one person to another b. any disease that is transmitted through direct person-to-person contact, by an animal that is infected, or through the environment c. a condition that develops in a baby during the mother's pregnancy or at birth d. a disease of the heart or blood vessels, such as hypertension, heart attack, and stroke

a

The thickness is  

b

 The thickness is  

Explanation:

From the question we are told that

    The wavelength of the laser light is  

    The refractive index of the plastic rod is

    The refractive index of the transparent coating is  

For maximum transmission of light into the rod the reflection would be minimum and this minimum reflection is mathematically represented as

Where m is the order of interference which is equal to 1

           t is the thickness

Substituting values

For minimum transmission of light into the rod the reflection would be maximum and this maximum reflection is mathematically represented as

Where m = 0 this because the transmission of light is minimum

Substituting values