IBL+Lesson+--+Thin+Converging+lens

**UNIT 10: LIGHT- An Eye Opening experience!**

**Lesson Objectives** In this lesson you will:
 *  learn about the different types of lens and their applications
 *  describe the effect of a thin converging lens on a beam of light
 *  understand technical terms used in converging lens, such as focal length, principal axis and focal point.

**Activity 1—A closer look.**
 * 1) Get a Singapore Dollar (any value)



2. Find the smallest word/sentence on the dollar by using just your eyes. 3. Now try using a magnifying glass and look carefully. Did you find it? 4. How did the magnifying glass help you? Discuss and comment below.

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 * Check out other look security features of the Singapore Currency @

**Activity 2- Far Far Away Lens**

1. You are given a set of magnifying glass. 2. Now, move the magnifying glass towards/away such that you can project a focused image on a blank paper 3. Describe the image you see in terms of size and orientation. Suggest another use of the lens of the magnifying glass. Comment below.

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Click to play the applet below. media type="custom" key="20534892" or go to []
 * Activity 3- Far Far Away Lens **

The applet simulates the image seen through a lens as you shift the position of object (arrow). || Enlarged/ Diminished/Same size || Upright/inverted || Same size as object / Opposite side of lens || 7. Discuss the changes in the images in the table above. Find out the differences and similarities. Suggest the range of position for the changes to happen. media type="custom" key="20534924"
 * 1) Set the applet as shown in your worksheet.
 * 2) The curvature radius determines the focal length of the lens. In this case, it is 0.70 m( 70 cm).
 * 3) Describe the size and orientation of the images as the pencil is placed at the positions indicated in the table below. Do this by circling the correct description below.
 * 4) Describe the size and orientation of the images as the pencil is placed at the positions indicated in the table below. Do this by circling the correct description below- Do this on your worksheet.
 * **Position of object from center of lens ****/cm ** ||  **Size of image compared to object **  ||  **Orientation of image compared to object **  ||  **<span style="font-family: Calibri,sans-serif;">Position of image **  ||
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">50 || <span style="font-family: Calibri,sans-serif;">Enlarged/ Diminished/Same size || <span style="font-family: Calibri,sans-serif;">Upright/inverted || <span style="font-family: Calibri,sans-serif;">Same size as object/ Opposite side of lens ||
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">60 || <span style="font-family: Calibri,sans-serif;">Enlarged/ Diminished/Same size || <span style="font-family: Calibri,sans-serif;">Upright/inverted || <span style="font-family: Calibri,sans-serif;">Same size as object / Opposite side of lens ||
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">80 || <span style="font-family: Calibri,sans-serif;">Enlarged/ Diminished/Same size || <span style="font-family: Calibri,sans-serif;">Upright/inverted || <span style="font-family: Calibri,sans-serif;">Same size as object / Opposite side of lens ||
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">100 || <span style="font-family: Calibri,sans-serif;">Enlarged/ Diminished/Same size || <span style="font-family: Calibri,sans-serif;">Upright/inverted || <span style="font-family: Calibri,sans-serif;">Same size as object / Opposite side of lens ||
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">140
 * <span style="display: block; font-family: Calibri,sans-serif; text-align: center;">180 || <span style="font-family: Calibri,sans-serif;">Enlarged/ Diminished/Same size || <span style="font-family: Calibri,sans-serif;">Upright/inverted || <span style="font-family: Calibri,sans-serif;">Same size as object / Opposite side of lens ||