Academic Year: 2017/2018 Term 3 Physics - Grade 10 Revision sheet Chapter 13: section 1,2,3 / Chapter 14: section 1 pages: ( ),( )
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1 Academic Year: 2017/2018 Term 3 Physics - Grade 10 Revision sheet Chapter 13: section 1,2,3 / Chapter 14: section 1 pages: ( ),( ) Spherical curved mirrors : a mirror that has the shape of part of spheres surface. Two types of spherical mirrors : 1- Concave spherical mirror : a mirror whose reflecting surface is a segment of the inside of a sphere -Called converging mirror (real focal point ) C: center of curvature, F: focal point, R: radius of curvature,f: focal length R=2*f -Real image : an image that is formed by the intersection of light rays ;a real image can be projected on a screen 2. Convex spherical mirror : a mirror whose reflecting surface is a segment of the outside of a sphere - Called diverging mirror (virtual focal point ) -Virtual image : an image from which light rays appear to diverge, and the virtual image can't be projected on a screen
2 For spherical mirrors,three reference rays are used to find the image point Rules Description Diagram When an incident ray travels parallel to the principal axis, it is reflected through the focus (F). When an incident ray passes through the centre of curvature (C), it is reflected back onto itself. When an incident ray passes through the focus (F), the reflected ray is parallel to the principal axis. 1. Part of a pencil that is placed in a glass of water appears bent in relation to the part of the pencil that extends out of the water. What is this phenomenon called? a. interference c. diffraction b. refraction d. reflection
3 2. The of light can change when light is refracted because the medium changes. a. frequency c. speed b. color d. transparency 3. What distinguishes a real image from a virtual image? a. Real images are inverted, whereas virtual images are upright. b. Real images can be displayed on a surface, whereas virtual images cannot. c. Real images can be larger or smaller than the object, whereas virtual images are equal in size to the object. d. Real images are possible with any type of mirror, whereas virtual images only occur with flat mirrors. 4. For a spherical mirror, the focal length is equal to the radius of curvature of the mirror. a. one-fourth b. one-half c. twice d. the square of 5. An object is located in front of a concave spherical mirror between the center of curvature (C) and the focal point (F). Where is the image located? a. behind the mirror b. between the mirror and the focal point c. between the focal point and the center of curvature d. beyond the center of curvature 6. Which of the following best describes the image produced by a flat mirror? a. virtual, inverted, and magnification greater than one b. real, inverted, and magnification less than one c. virtual; upright, and magnification equal to one d. real, upright, and magnification equal to one Q1: Find the angle of refraction of a ray of light that enters fused quartz (nr = 1.458) from water (ni = 1.333) at an angle of 35.0.
4 Q2. A 1.0 cm tall object is placed 6.0 cm away from a concave mirror that has a 4.0 cm focal length. a. Where will the image be located? (use the mirror equation to find di b. Draw a ray diagram below to locate the image Q3. What is the angle of refraction? n1 = 1 24 n2 = 1.8 Q4. Label the curved mirror using page
5 Q5. A concave shaving mirror has a focal length of 30cm. Calculate the image position of a 10 cm tall cologne bottle placed in front of the mirror at a distance of 15 cm. a. Calculate the magnification of the image. b. Is the image real or virtual? c. What is the height of the image in the mirror? Q6. An object is located 25 cm in front of a concave mirror. If the mirror has a focal length of 15 cm, where will the image be located? (Use the mirror equation to find the image distance) Q7. Complete the following ray diagram Image properties
6 Q8. An object is placed 10cm in front of a convex mirror with a virtual focal length of 15 cm. Where will an image be formed? What will the image look like? Q9. Red light has a wavelength of 450 nm, what is frequency? 1- If the object is located "beyond" the center of curvature. Description of Image: Location: O: Upright or Inverted S: Magnified or Reduced T: Real or Virtual 2- If the object is located at the center of curvature. Description of Image: Location: O: Upright or Inverted S: Magnified or Reduced T: Real or Virtual Case 3: If the object is located Q10. True or false : 1. Rays perpendicular to the principal axis of a concave mirror converge at or near the focal point. 2. The focal length of a concave mirror is half the radius of curvature of the mirror. 3. Concave mirrors can produce only virtual images. 4. Concave mirrors cannot act as magnifiers. 5. The focal point of a convex mirror is behind the mirror.
7 6. Rays reflected from a convex mirror always converge. 7. The images produced by convex mirrors are real images. 8. Compared to the size of the objects, the images produced by convex mirrors are always the same size. 14. Sketch the light rays paths as they pass through each material in the following situations. Draw in the normal. (You will need to work out whether the light ray refracts towards the normal or away from the normal) (a) namber = 1.55 (b) nacetone = 1.36 ndiamond = 2.42 nwater=1.33
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