Science

March / April

__Light and Shadows __ Students will learn to:

1. Recognize that eyes can be damaged by bright lights and that one should not look at

the Sun—either directly or with binoculars or telescopes.

2. Identify a wide range of sources of light, including the Sun, various forms of electric

lights, flames, and materials that glow (luminescent materials).

3. Distinguish objects that emit their own light from those that require an external source of

light in order to be seen.

4. Demonstrate that light travels outward from a source and continues unless blocked by an

opaque material.

5. Describe changes in the size and location of Sun shadows during the day—early morning, to midday, to late afternoon.

6. Recognize that opaque materials cast shadows, and predict changes in the size and

location of shadows resulting from the movement of a light source or from the movement of a shade-casting object.

7. Distinguish transparent materials from opaque materials by determining if light passes through them and by examining their shadows.

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