PHYS 131 Lecture Notes - Lecture 5: Virtual Image, Plane Mirror, Real Image

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champagneotter506

14 Nov 2017

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Explain how mirrors focus light to form images. Summarize rules for ray-diagram tracings of mirror systems. When we make images, we want to know: A real image is formed when the light-rays from an object are made to converge and cross by some optical device. If a screen is placed at the point where the rays cross, the image will be formed on it. A virtual image is formed when diverging light-rays from an object appear to come from a point behind an optical device. The image in this case cannot be formed on a screen. You must look into the optical device to see the image. Concave surface: parallel rays converge from surface: a real image point forms in front of mirror. Convex surface: rays diverge from surface; looking in the mirror we see a virtual image point behind the mirror.

Related Questions

1. Geometrical Optics: A candle is at the center of curvature of aconcave mirror with focal length of fm= 10 cm. A divergingent lenshas a focal length of f1= 20 cm and is 60 cm to the right of thecandle. The lens forms two images of the candle. The first isformed by light passing directly through the lens. The second imageis formed from the light that goes from the candle to the mirror,isreflected, and then passes through the lens.

A. Use ray tracing techniques on the diagram above to determinethe approximate position ofeach image.

B. Determine the location of each of the images with respect tothe mirror.

C. Are they real or virtual? (give your answers for each of theimages).

Image1: REAL or VIRTUAL

Image2: REAL or VIRTUALD.

Are they upright or inverted?

Image1: UPRIGHT or INVERTED

Image2: UPRIGHT or INVERTEDE.

If the candle height is 5 cm what will be the height of theimages

In many cars, the passenger's side mirror has the following warning "Objects in mirror are closer than they appear" embossed on the mirror surface. Your group decides to conduct the following experiment to verify this statement. One member of your group holds a plane mirror just below the passenger's side mirror (radius of curvature =1.60 m) so that you can view an 8.4-cm tall object 2.4 m away from both mirrors. By placing a small ruler on the surface of each mirror, you find that the object appears to be 2.10cm tall in the plane mirror and 1.20cm tall in the passenger's side mirror when you view the images at a distance of .80m in front of the mirrors. Are the images real or virtual? Is the passenger's side mirror concave or convex? Show why the image in the passenger's side mirror appears to be farther away than the object actually is or as viewed on the plane mirror. (Hint:Draw a ray diagram of the object, image, mirror, and your eye for each mirror so that you have a better idea of what your eyes see i.e. the apparent angular size of the image and the corresponding apparent distance away as seen by your eye for both mirrors)

Your telescope has an objective lens with a focal length of 1.0 m.You point the telescope at the moon, only to realize that theeyepiece is missing. Even so, you can still see the real image ofthe moon formed by the objective lens if you place your eye alittle past the image so as to view the rays diverging from theimage plane, just as rays would diverge from an object at thatlocation.
What is the angular magnification of the moon if you view its realimage from 25 cm away, your near-point distance?

PHYS 131 Lecture Notes - Lecture 5: Virtual Image, Plane Mirror, Real Image

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Physics: Principles with Applications

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