A small candle is lit and placed 8.0 cm in front of a convex lens with a focal length of 5.0 cm.?

A. What is the distance to the image of the flame formed by the lens?


b. What is the magnification of the image?


c. Is the image real or virtual? upright or inverted?

A small candle is lit and placed 8.0 cm in front of a convex lens with a focal length of 5.0 cm.?
a. 1/o + 1/i = 1/f... i = 1 / (1/f - 1/o) = 1 / (1/5 - 1/8)


b. i/o = 1 / (1/5 - 1/8) / 8


c. An easy rule to follow: if the image distance is negative, it's virtual and upright... otherwise it's real and inverted. This one is positive.





Note that a real image is visible on a screen... if you can get your hands on a magnifying glass, go to a dark room that has a window during the day. Open the window just enough to see outside. Place the magnifying glass between the window and a wall, and try to position it so that the image of the window (and outside) is in focus on the wall. This is a real image (and inverted) because you can put the image on a screen.





Now use the same magnifying glass to look at something small (normal usage of a magnifying glass), the image you see from looking through the magnifying glass is virtual (and upright), because the image can only be seen with the eye, not a screen.

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