S Size T Type More on this examples later Curved Mirrors Mirrors do not always

S size t type more on this examples later curved

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S= Size T= Type - More on this + examples later Curved Mirrors - Mirrors do not always have to be plane, they can be convex( outwards vertex) , or concave (inwards vertex) - Curved mirrors have a center of curvature, analogous to the center of a circle Principal axis - runs through the center of curvature of the mirror Meets mirror at vertex All rays that enter the mirror parallel to the principal axis will converge at the focus video reference: ( speed up to 1.5x) Drawing Ray Diagrams When drawing ray diagrams with a converging/ concave mirrors, we focus on four rays : 1. A ray goes in parallel to the principal axis, reflects through the focus 2. A ray through F will reflect back parallel to the principal axis 3. A ray through the centre of curvature, reflects back on itself 4. A ray at the vertex follows the law of reflection
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When drawing ray diagrams with diverging/ convex mirrors, we focus on three rays: 1. A ray parallel to the principal axis, reflects out as if it came from the focus 2. A ray towards F will reflect back parallel to the principal axis 3. A ray through the center of curvature, will reflect back on itself. Where the rays converge is where the image forms Real image- can be focused onto a screen where all light rays meet Virtual image- don’t meet, but appear to originate from somewhere QUIZ QUESTIONS: - Types of light - Forms of radiation - Laws of reflection - Ray diagrams for convex and concave Significant Figures -used for numbers that are really big or really small ex : 6.67 x 10^6 We use scientific notation for numbers smaller than 0.01 or greater than 1000
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Sometimes we need to use scientific notation to rep the correct number of significant figures Must be greater than 1, smaller than 9 42.5 x 10^9 - incorrect 4.25 x 10^10 correct Original number - bigger than 10- positive exponent Original number - smaller than 10- negative exponent When converting scientific notation to standard notation, move the decimal the same number as the exponent Positive exponent- move to right Negative exponent - move to left Scientific Prefixes - Scientists will often use prefixes to change the size of a basic unit - Base many lengths on metres, centimetres, or kilometres We can replace scientific notation with a scientific prefix on the unit if the exponent is the same Ex; 1500 meters - 1.5 x 10^3 m - 1.5 km 0.0053 g- 53.00 x 10^-3 - 53.7 mg Scientific Figures & Measurements Units of Measurements Each measurements are taken
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When we record quantitative data, we record all certain numbers, and estimate one more The number of certain digits are sig figs Significant Figures Sig figs are the digits recorded for any scientific measurement They include all digits you are certain about plus the one uncertain digit Rules For Significant Figures 1. All non-zeros are significant 1573 - (4) 12.456 - (5) 2. Zeros between non-zeros are significant 102- 3 1005-4 3. Zeros to the left of the value are significant 1.02 0.00-105 4. Zeros to the right may be significant Zeros to the right in d significant
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