The figure is a scaled diagram of an object and a converginglens. The focal leng
ID: 1744469 • Letter: T
Question
The figure is a scaled diagram of an object and a converginglens. The focal length of the lens is 5.0 units. An object isplaced 3.0 units from the lens as shown.
The object has a height of 1.5 units. What is the approximateheight of the image? a. 2.0 units b. 1.2 units c. 5.0 units d. 3.8 units e. 9.8 units
Which pair of terms most accurately describes the image? a. real, upright b. real, enlarged c. real, inverted d. virtual, inverted e. virutal, upright
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Explanation / Answer
f=5 units u=3units so object distance is less than the focal length hence image will be formed on the same side 1/v=1/f-1/u=1/5-1/3=0.2-0.33=-0.13 so v=-7.692units negative sign indicates that the image is virtual magnification m= v/u=7.692/3=2.564 so size of the image=magnification*size of theobject=2.564*1.5=3.846 units. hence option D is correct. part B ------------- the image is virtual and upright. hence option E is correct.