Question

please explain and solve only the pre lab

If you combine the equations from the previous page you should find B. Using the Lens/Mirror Equation So the same equation works for mirrors and lenses because the similar triangles are You should be following along. Start with the above relation and, in the box below, show essentially the same in each case, and the ratios of sides are the same. Now you get to try using this equation. the algebraic steps in the derivation of the lens/mirror equation. The manufacturer says your lenses have focal lengths of 40.0cm (unless the lens holder says otherwise). When using this value with the lens equation, we must measure all distances with respect to the point on the center of the curved face. When making ray diagrams, as in Experiment 2 you will need to draw a vertical line through the center of the lens and have this be the single point where refraction occurs. In both cases, this is because of the thin-lens approximation we are making. Algebra Box Draw the ray diagram for an object with "d" of 20cm for a convex lens with f-40cm intermediate step:--1+- Remember that when tracing back virtual rays (where no light really went) you should use dotted lines. (The signs of d and m are important, so keep track of them If the image is on the same side of the lens as the object, d is negative. Opposite side, positive.) Also calculate the quantity Lens/Mirror Equation: 2. To see why mirrors work the same way as lenses, use the ray diagrams for these mirrors, and shade in the similar triangles which imply the given relations. h: Measure the image distance with a ruler using your diagram as a scale model. Then measure your object distance. Measured values: d- Now use the lens equation to check your diagram by calculating d and m, and comparing the latter to your drawing. (A scale model means sizes will be different, but ratios of sizes will be the same as in reality. One such ratio is m.) Show your work. h: 3. The second relation is only approximate. Study the diagram and explain why this is. Calculated values: d- 3-2 3-3

Answer 1

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