Key Words in P7 Some Key Terms You Need To Know 5.0 / 5 based on 1 ratingTeacher recommended ? PhysicsAstronomyLight and OpticsGCSEOCR Created by: Holly JacksonCreated on: 01-11-13 09:05 The apparent reversal in an astronomical objects usual direction of movement, as seen from the earth on a background of fixed stars, Retrograde Motion 1 of 11 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. Solar Eclipse 2 of 11 The type of day in which the Earth rotate 360º on its axis and the sun WILL NOT be seen directly over head. Sidereal Day 3 of 11 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. Solar Day 4 of 11 The Earth passes directly between the Sun and the Moon, casting a shadow of the Earth on the surface of the Moon. Lunar Eclipse 5 of 11 When waves or light change direction as they move from one substance to another. Refraction 6 of 11 A lens curing outwards which will have a shorter focal length and therefore be a more powerful lens. Convex Lens 7 of 11 What the power of the lens is measured in and can be found by 1 over the focal length of lens in meters. Dioptres 8 of 11 A lens that causes parallel waves of light to come into focus. Converging Lens 9 of 11 The point where waves of light come into focus Focal Point 10 of 11 When waves move through a narrow gap or past an obstacle, they spread out from the edges. Diffraction 11 of 11
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