Revise format of PHSI191 and CHEM191

For PHSI191, I have decided to change the method of presentation to a more exam oriented based presentation. I will be featuring the highlight formulas for each modules along with example questions. The overview of the newly revised PHSI191 is as below:

Geometric optics

n=c/v where n is refractive index and c is speed of light in vacuum (3*10^8) and v is the speed of light in the material. Light in air is treated to have speed of light in vacuum and when the light crossed through an object with different density and property as air ( a glass forever), the light will be refracted at a speed lower than that of in light since density of the object will be heavier than the density in air.

Snell’s law

n(1)sin θ(1) = n(2)sin θ(2)

Normally in exams, the light will always be going through air then into a certain object like glass. For instance, if a light makes an incidence entry of 50 degrees from air int a glass with a refractive index of 1.33 then what would the angle of refraction be when the light enters the glass?

Step 1: concept: optic, refractive

Step 2: parameter needed to identify is refractive angle in glass

Step 3: Information given are n(1) which is refractive index of air of 1.00 (though not explicitly given its understandable that air has n of 1.00), n(2) is refractive index of glass which is 1.33 and angle of incidence ie. θ(1) of 50 degrees.

Step 4: solve

Use n(1)sin θ(1) = n(2)sin θ(2)

1sin50=1.33sin θ(2)

θ (2) = 35 degrees

When I introduce the questions, I will provide step by step methods and explanation as shown above to explain. Apart from that, I will be providing online tutorials on PHSI191 and CHEM191 using the same style of format. For PHSI191, for each module of force, work, electricity, optics and so on there will be 2 worksheets each with step by step methods as shown above. These worksheets will be exactly taken from past year so it would be relevance for preparation for the finals. Each worksheet will have 10 questions selective chosen from the finals to aid revision purposes and each worksheet will be sold at 5 dollars each. This is a minimal price compared to having to go to tutorials and you can work these worksheets at home at your own pace. Same goes for CHEM191 which will presented in the same manner: exam questions and step by step answers and each worksheet has around 2-3 long questions.