Key Words in P7

1. A lens that causes parallel waves of light to come into focus. (10, 4)
4. What the power of the lens is measured in and can be found by 1 over the focal length of lens in meters. (8)
5. A lens curing outwards which will have a shorter focal length and therefore be a more powerful lens. (6, 4)
6. The type of day in which the Earth rotate 360º on its axis and the sun WILL NOT be seen directly over head. (8, 3)
7. When waves or light change direction as they move from one substance to another. (10)
8. The type of day in which the Earth rotate a little more than 360º on its axis in order for the sun to be seen directly over head. (5, 3)

2. The Earth passes directly between the Sun and the Moon, casting a shadow of the Earth on the surface of the Moon. (5, 7)
3. The Moon passes directly between the Sun and the Earth, on the same line, casting a shadow of the Moon on the surface of the Earth. (5, 7)
7. The apparent reversal in an astronomical objects usual direction of movement, as seen from the earth on a background of fixed stars, (10, 6)
9. When waves move through a narrow gap or past an obstacle, they spread out from the edges. (11)

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