SHADOWS AND ECLIPSE
- 1. Shadows & Eclipses For Class IV & V
- 2. Shadows & Eclipses Light travels in straight lines. This property of light forms shadows.
- 3. (A) Classification Of Objects Light Source Glass Slab If a glass slab is kept in the path of light, it allows light to pass through it. Such objects which allow light to pass through them are called transparent objects. They do not form shadow. eg. glass.
- 4. Translucent Light Source Butter Paper Faint Shadow If a butter paper is kept in the path of light, it allows some light to pass through it. Such objects which allow only partial light to pass through them are called translucent objects. They form faint shadows eg. butter paper
- 5. Opaque Light Source If a book is kept in the path of light, it does not allow any light to pass through it. Such objects which do not allow any light to pass through them are called opaque object. They form dark shadows. eg. book, brick
- 6. (B)Properties of Shadows 1) Formation of Shadows Light Source Shadow is always formed in the opposite direction to the source of light.
- 7. 2) Object at Less Distance Light Source Big & Faint Shadow If the distance between the source of light and the object is less, the shadow formed is faint and bigger in size than the object.
- 8. 3) Object at More Distance Light Source Sharp & Small Shadow If the distance between the source of light and the object is more, the shadow formed is sharp and smaller in size than the object
- 9. 4) Movement of Shadow Light Source Shadow moves if the source of light moves and the object is stationary and vice versa.
- 10. C) Movement of Earth & Moon 1) Rotation Our earth rotates on its own axis from west to east. The movement of earth on its own axis is called rotation. Day and night are formed due to this rotation of earth. Te earth completes one rotation in 24 hours
- 11. C)Movement of Earth & Moon 2) Revolution Our earth also moves around the sun. This movement of earth around the sun is called Revolution. Different seasons occur due to this revolution of earth. The earth completes one revolution around the sun in one year. The moon revolves around the earth. SUN Earth
- 12. D) Eclipse 1) Lunar Eclipse Moon When the sun, earth and moon are in a straight line and earth is in the middle such that the completely dark shadow of earth falls on the moon, a lunar eclipse occur. It occurs on purnima night only. EarthSUN
- 13. 2) Solar Eclipse When the sun, moon and the earth are in a straight line and moon is in the middle such that the shadow of moon falls on the earth, a solar eclipse occur. It occurs on Amavasya night only. EarthMoon SUN