Part 2 only Part 2:Note: A starter code is provided called A4_starter.py, use this as the template and fillout the necessary bits in the code to implement the required functionality. The code alsocontains comments that complement instructions in this document, so read both.Imagine that you are writing a Python program that will be used by a few geologicaresearchers. Each researcher has a set of unknown crystals and wants to determinewhat they are, and how they bend light. Each researcher has done a series ofexperiments to determine the refractive indices of a set of unknown materials.Unfortunately, their experiment does not produce exact values, but they are within+0.02 of known refractive indices of materials. They wish to know what the materialsare, and what the angle of refraction would be if they stacked these materials togetherin various orders. You should create a Python program that takes in a set of commaseparated values corresponding to the refractive indices of each layer in the stack. Yourprogram must:1. Determine the material corresponding to the given refractive index2. Print out line-by-line the material name and the angle of refraction at that layer (2decimal places).3. Loop back until the user decides to quit.The following table lists some materials and their refractive indices:MaterialDiamondSapphireEmeraldOpalPearlThis table is given to you as a list-of-lists in the Python code. Each element of the outerlist is a list of two items: the name and the refractive index. You must ONLY USE THELIST-OF-LISTS to determine the most likely material corresponding to the user input.You will need to iterate over the list-of-lists and check for which of the materials has arefractive index that is within ±0.02 of a given layer.Assumptions:●Refractive Index2.421.781.581.451.52User will always enter values that are reasonable.● User may enter any number of values but will enter at least one value.Hints:Look at the .split() method covered in class to figure out how to separate thevalues.You can use a nested for loop to get the refractive index of each item, thendecide if it is within +0.02 of known values.O Look at the abs() function covered in the class, can that be used here?Don't forget degrees to radians conversion, as necessary!Sample Input and Output (match exactly):Note: Contains 3 sets of inputsEnter the angle of incidence (in degrees):22.5Enter the refractive indices as comma separated values:1.569,1.539,1.770,1.456,2.437Layer 1 is made of Emerald. Angle of refraction is 14.12 degrees.Layer 2 is made of Pearl. Angle of refraction is 14.40 degrees.Layer 3 is made of Sapphire. Angle of refraction is 12.49 degrees.Layer 4 is made of Opal. Angle of refraction is 15.24 degrees.Layer 5 is made of Diamond. Angle of refraction is 9.03 degrees.Do you want to enter more values? Enter 'y' or 'yes' to continue, or anything else to quit:yEnter the angle of incidence (in degrees):66.6Enter the refractive indices as comma separated values:1.469,1.799,2.402,1.561Layer 1 is made of Opal. Angle of refraction is 38.66 degrees.Layer 2 is made of Sapphire. Angle of refraction is 30.67 degrees.Layer 3 is made of Diamond. Angle of refraction is 22.46 degrees.Layer 4 is made of Emerald. Angle of refraction is 36.01 degrees.Do you want to enter more values? Enter 'y' or 'yes' to continue, or anything else to quit:YESEnter the angle of incidence (in degrees):39Enter the refractive indices as comma separated values:1.786,1.580Layer 1 is made of Sapphire. Angle of refraction is 20.63 degrees.Layer 2 is made of Emerald. Angle of refraction is 23.47 degrees.Do you want to enter more values? Enter 'y' or 'yes' to continue, or anything else to quit:no Exercise for Submission:Part 1:Refraction is the binding of a light ray as it passes from one medium to another, forinstance from air to water. This phenomenon is why your straw appears to be distortedwhen you put it in a glass of water. The refractive index of a medium describes howmuch that medium can bend a ray of light. Consider the following setup where a lightray passes from air to a slab of glass.AirAngle ofincidenceGlassAngle ofrefractionThe angle of the light ray measured at the surface of the glass is called the 'angle ofincidence' and the angle of the light ray inside the glass is called the 'angle ofrefraction'. Snell's law links these angles to the refractive indices as follows:n₁ sin 0₁ = n₂ sin 0₂In the above equation, 0₁ and 0₂ are the angles of incidence and refraction respectively,and n₁, n₂ are the refractive indices of air and glass respectively.Now assume the following scenario: there are layers of materials, each with potentiallydifferent refractive indices, stacked side-by-side.Air●●Material 1Assume that the user will supply the angle of incidence and the refractive indices of allthe materials, derive the equation for the angle of refraction (in degrees) at the finallayer (the right most in the diagram). You can:•ignore any reflection, loss of intensity, etc.,Can assume that the layers are perfectly stacked (i.e., no gaps),● The layers are large enough that the light will always reach the last layer,Assume that the refractive index of air is equal to 1,• Angles are in degrees,Use the first test case for your numerical part.Hints:Material 2Material nYou can start out by looking at one layer at a time, and considering the output ofone layer as input to the next layer.O Does the final angle of refraction at the final layer depend on any of themiddle layers?

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This question involves writing a Python program that can be used by geological…