MATERIALS Light box optical bench mirror and lenses screen PRELIMINARY QUESTIONS
ID: 1555652 • Letter: M
Question
MATERIALS Light box optical bench mirror and lenses screen PRELIMINARY QUESTIONS Is the image projected on a movie screen real or virtual? What about the image of yourself seen in a bathroom mirror? Hold a shiny spoon in front of you. What differences do you notice about the image of your face seen in the convex and concave sides? Where are the images formed by each side of the spoon? In front or behind the spoon? (Try the parallax method. Look at the image of an overhead light. Hold the tip of a pencil where you think the image is. Move your head from side to side. If the image and pencil tip appear to move relative to each other, adjust the position of the pencil back and forth until they appear to move as one.) PART 1: CONCAVE MIRROR CAUTION: In order to remove, install or change the position of any of the lens/mirror holders, gently squeeze the plastic tab on the side of the holder and then slide the holder along the optical bench Do not lift the holder straight up to remove or push straight down to install.Explanation / Answer
1. If an image can be projected on a screen it has to be a real image. So the image on a movie screen is real.
The image of ourselves in the mirror is a virtual one. As it is formed behind the mirror and cannot be obtained on a screen
2. In the covex side, we will see a virtual and diminished image of our face. Because convex mirrors always produce magnification less than one. And also the image is always virtual. In case of concave side, if you hold your face too close to the spoon an enlarged virtual image can be seen. For large distance you wont see any image in the spoon, but it will produce a real image which is obtainable on a screen.
3. this is just an exercise to prove the above mentioned points. The results won't differ.
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