Ray Tracing with Convex Lenses: Magnification and Focal Length, Lab Reports of Physics

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Taylor Williams

Ray Tracing (Lenses)

July 23, 2022

Week 7

Objectives Observe light rays that pass through a convex or concave lens. Manipulate the position of an object and the focal length of the lens and measure the distance and size of the resulting image. My hypothesis is that the image will depend on the distance and focal point on how big the image will be Data Q1What are two ways you could increase the magnification (increase the size of the image) in the situation shown below? A1: Move the candle to the right, or the focal point to the left. Q2: A large convex lens stands on the floor. The lens is 180 cm tall, so the principal axis is 90 cm above the floor. A student holds a flashlight 120 cm off the ground, shining straight ahead (parallel to the floor) and passing through the lens. The light is bent and intersects the principal axis 60 cm behind the lens. Then the student moves the flashlight 30 cm higher (now 150 cm off the ground), also shining straight ahead through the lens. How far away from the lens will the light intersect the principal axis now A2: 60cm Q3: An object is located 8 cm away from a convex lens. The image is 24 cm away from the lens on the other side. What is the focal length of the lens? A3: 6cm Q4: A student has a convex lens with a focal length of 12 cm. How close should she put an object to the lens if she wants the image to be inverted and magnified by a factor of 3? A4: 16cm

focal point and the lens, the image appears on the same side as the actual object. So that all the lens-related formulas still work, both the distance from the image to the lens (di) and the distance from the image to the focal point (si) are given as negative values. Summary To sum everything up the magnification depends on the type of lens and how close the focal point is to the lens and the distance of the candle to lens. With the convex lens it depends on the focal point and how far the candle is for the magnification. With concave the image will always be smaller. My hypothesis is accepted because the image depends on the focal point and the distance with the convex lens but not with the concave lens.