Light Reflection and Refraction Chapter 10
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Questions and Answers

What is the phenomenon where light bends around a small opaque object?

  • Refraction
  • Transmission of light
  • Image formation
  • Diffraction (correct)

    • What is the term used to describe the path of light?

  • Wave
  • Shine
  • Beam
  • Ray (correct)

    • What is the primary reason why we are unable to see objects in a dark room?

  • Because there is no light to fall on the objects (correct)
  • Because our eyes are unable to detect objects
  • Because light is not transmitted through the medium
  • Because objects do not reflect light

    • What is the reason why we can see objects through a transparent medium?

    <p>Because light is transmitted through the medium</p> Signup and view all the answers

    What is the phenomenon where light is redirected by a medium, resulting in a change in its direction?

    <p>Refraction</p> Signup and view all the answers

    Why does the straight-line treatment of optics using rays fail in certain situations?

    <p>Because light has a tendency to bend around small objects</p> Signup and view all the answers

    What is the significance of a negative sign in the value of the magnification?

    <p>The image is real</p> Signup and view all the answers

    What is the formula to find the focal length of a mirror?

    <p>f = R/2</p> Signup and view all the answers

    If the image distance is 7.50 m, what is the radius of curvature of the mirror?

    <p>3.00 m</p> Signup and view all the answers

    What is the magnification of an object when it is placed at a distance of 5.00 m from a convex mirror of radius of curvature 3.00 m?

    <p>0.23</p> Signup and view all the answers

    If an object is placed at a distance of 25.0 cm from a concave mirror of focal length 15.0 cm, what is the distance of the image from the mirror?

    <p>37.5 cm</p> Signup and view all the answers

    What is the size of the image formed by a concave mirror when an object of 4.0 cm is placed at a distance of 25.0 cm from the mirror?

    <p>0.92 cm</p> Signup and view all the answers

    What is the point on the principal axis where the rays of light appear to diverge after refraction from a concave lens?

    <p>Principal focus</p> Signup and view all the answers

    What is the distance between the position of the lens and the position of the image of the Sun in Activity 10.11?

    <p>Focal length of the lens</p> Signup and view all the answers

    How many principal foci does a lens have?

    <p>Two</p> Signup and view all the answers

    What is the letter used to represent the focal length of a lens?

    <p>f</p> Signup and view all the answers

    What is the purpose of drawing five parallel straight lines on a long table in Activity 10.12?

    <p>To determine the focal length of the lens</p> Signup and view all the answers

    What is the correct sequence of steps to find the approximate focal length of a convex lens?

    <p>Take a convex lens, then find its approximate focal length, then draw five parallel lines</p> Signup and view all the answers

    What is the point on the surface of a spherical mirror represented by the letter P?

    <p>Pole</p> Signup and view all the answers

    Which of the following statements is true about the centre of curvature of a concave mirror?

    <p>It lies in front of the mirror</p> Signup and view all the answers

    What is the letter R used to represent in spherical mirrors?

    <p>Radius of curvature</p> Signup and view all the answers

    What is the name of the point that lies outside the reflecting surface of a spherical mirror?

    <p>Centre of curvature</p> Signup and view all the answers

    What can be approximated by the surface of a spoon curved inwards?

    <p>Concave mirror</p> Signup and view all the answers

    What is the distance between the pole and the centre of curvature equal to?

    <p>Radius of curvature</p> Signup and view all the answers

    What is the significance of the positive sign of v in the lens equation?

    <p>The image is formed at a distance of 30 cm on the other side of the optical centre.</p> Signup and view all the answers

    What is the formula for the magnification of an image formed by a lens?

    <p>m = v/u</p> Signup and view all the answers

    What is the effect of a convex lens with a short focal length on light rays?

    <p>It focuses light rays closer to the optical centre.</p> Signup and view all the answers

    What is the degree of convergence or divergence of light rays achieved by a lens expressed in terms of?

    <p>Its power.</p> Signup and view all the answers

    What is the height of the image formed by the lens, given that the object distance is 15 cm and the focal length is 10 cm?

    <p>-4.0 cm</p> Signup and view all the answers

    What is the magnification of the image formed by the lens, given that the object distance is 15 cm and the image distance is 30 cm?

    <p>+2</p> Signup and view all the answers

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