State the law of refraction (Snell-Descartes law) at the air --> acrylic interface in terms of the angles of incidence θi and refraction θr as well as the refractive index of acrylic n. Identify the dependent variable, the independent variable, the constant(s), and the parameter to be determined. Is the relationship between your dependent and independent variable linear? If yes: Indicate the value of the slope (m=?) and the ordinate at the origin (b=?) If not: define a new independent variable (x) and a new dependent variable (y) using your original variables (as well as your constants if necessary). Make your choice so that the relationship between your new variables x and y is linear: y=mx+b. Indicate the slope value (m=?) as well as the intercept (b=?).

State the law of refraction (Snell-Descartes law) at the air --> acrylic interface in terms of the angles of incidence θi and refraction θr as well as the refractive index of acrylic n. Identify the dependent variable, the independent variable, the constant(s), and the parameter to be determined. Is the relationship between your dependent and independent variable linear? If yes: Indicate the value of the slope (m=?) and the ordinate at the origin (b=?) If not: define a new independent variable (x) and a new dependent variable (y) using your original variables (as well as your constants if necessary). Make your choice so that the relationship between your new variables x and y is linear: y=mx+b. Indicate the slope value (m=?) as well as the intercept (b=?).