3.2.3. Thin lenses
A subsection of Physics, 5054, through 3. Waves
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A burning candle is placed close to a thin converging lens. The candle acts as the object. A white, vertical screen is moved to a position on the other side of the lens from the candle. is a full-scale diagram, on graph paper, of the lens and the screen. lens screen Y image of candle The focal length of the lens is 2.4 cm. The screen is 7.2 cm from the centre of the lens. A sharply focused, inverted image of the candle is produced on the screen, as shown in . Define the term focal length. On , mark and label with an F, each of the two focal points (principal focof the lens. The point Y is the tip of the image. On , draw a ray diagram to locate the position of the top of the object. Label this point X. Using , determine the distance of the candle from the centre of the lens. distance =
5054_w15_qp_21
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2015
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