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Data Table 2: Focal length (f) = +7cm Object Height (h.) = 2cm Object Distance (d.) Image Distance (d;) Image Height (h,) Image Description (Check the correct word for each pair) 12cm Real Upright Enlarged Virtual O Inverted Reduced 9cm a Real Upright Enlarged Virtual Inverted Reduced 6cm a Upright Enlarged O Virtual O Inverted 0 Reduced 2cm Upright Enlarged Virtual Inverted Reduced Use the 12cm object and image distances to calculate the Use the focal length and the 6cm object distance to calculate the focal length. image distance. Did you get 7cm? Did you get the same as your measured d? Find the magnifications for each set of data. **Use the distance magnification equation: "*Use the height magnification equation: do = 2cm do = 9cm do = 6cm do = 12cm We will now look at concave lenses. Move the ( Focus ' ) point to the RIGHT side of the lens to change it to a concave lens. Specifically, set the focal length to -4cm, start the object at 12cm, and the initial object height to 2cm. Answer the following questions about concave lenses 1. To change the object height, click the object arrow head and make it taller and shorter. As the object gets taller, the image size ( increases decreases ; stays the same ). 2. To change the object distance, click the object arrow head and move it left and right. Start with the object directly on the left focal point ( Focus ). Describe the image: a. Move the object farther from the lens (object distances larger than the focal length). On what side of the lens does the image appear? For distances larger than the focal length, as the distance between lens and object increases, the image size (increases ; decreases ; stays the same ). When object distance is LARGER than the focal length, the image is always ( virtual ; real ; undefined ) and ( upright ; inverted ; undefined ). b. Return the object to the left focal point ( Focus ). Move the object closer to the lens (object distances smaller than the focal length). On what side of the lens does the image appear now? For distances smaller than the focal length, as the distance between lens and object decreases, the image size ( increases ; decreases ; stays the same ). When object distance is SMALLER than the focal length, the image is always ( virtual ; real ; undefined ) and ( upright ; inverted ; undefined ). 3. Start with the object at a distance of 12 and height of 2. To change the focal length, click the dot at ( Focus ) and move it left and right. Move the right focal point to larger values. As the focal length increases, the image size ( increases ; decreases ; stays the same )