Quantum Theory of Light
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Questions and Answers

What is the name of the line passing through the pole and the centre of curvature of a spherical mirror?

  • Principal axis (correct)
  • Focal line
  • Principal line
  • Central axis

    • What is the relationship between the principal axis and the mirror's surface?

  • The principal axis intersects the mirror's surface at an angle.
  • The principal axis is perpendicular to the mirror's surface. (correct)
  • The principal axis has no relationship to the mirror's surface.
  • The principal axis is parallel to the mirror's surface.

    • Why should you not look directly at the Sun or into a mirror reflecting sunlight?

  • It can damage your eyes. (correct)
  • It can cause temporary blindness.
  • It can cause a fire hazard.
  • It is illegal to look directly at the Sun.

    • What happens when you hold a concave mirror towards the Sun and focus the reflected light onto a sheet of paper?

    <p>The paper will begin to burn and produce smoke.</p> Signup and view all the answers

    What is the point where the reflected light from the Sun is focused by the concave mirror called?

    <p>Focal point</p> Signup and view all the answers

    How can you determine the approximate focal length of the concave mirror using the experiment?

    <p>By measuring the distance between the mirror and the paper where the bright spot appears.</p> Signup and view all the answers

    What is the magnification produced by a spherical mirror?

    <p>The ratio of the height of the image to the height of the object</p> Signup and view all the answers

    What happens when a light ray travels obliquely from a denser medium to a rarer medium?

    <p>The light ray bends away from the normal</p> Signup and view all the answers

    What is the speed of light in vacuum?

    <p>$3 \times 10^8$ m/s</p> Signup and view all the answers

    What is the refractive index of a transparent medium?

    <p>The ratio of the speed of light in vacuum to that in the medium</p> Signup and view all the answers

    What happens to the emergent ray when light passes through a rectangular glass slab?

    <p>The emergent ray is parallel to the direction of the incident ray</p> Signup and view all the answers

    Which of the following is the lens formula?

    <p>$\frac{1}{u} + \frac{1}{v} = \frac{1}{f}$</p> Signup and view all the answers

    What will happen if one-half of a convex lens is covered with a black paper?

    <p>The lens will produce a partial image of the object</p> Signup and view all the answers

    An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. What is the position, size, and nature of the image formed?

    <p>The image is formed at 15 cm, is 2.5 cm in size, and is real and inverted</p> Signup and view all the answers

    A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens?

    <p>20 cm</p> Signup and view all the answers

    What does a magnification of +1 produced by a plane mirror mean?

    <p>The image is the same size as the object</p> Signup and view all the answers

    A doctor has prescribed a corrective lens of power +1.5 D. What type of lens is this?

    <p>Converging lens</p> Signup and view all the answers

    What is the focal length of a lens with a power of -2.0 D?

    <p>-1.0 m</p> Signup and view all the answers

    What causes a pencil to appear displaced when partially immersed in water?

    <p>The light from the pencil inside water seems to come from a different direction.</p> Signup and view all the answers

    If a glass slab is placed over letters, what happens to their appearance?

    <p>The letters appear to be raised.</p> Signup and view all the answers

    Does the extent of the apparent displacement depend on the medium?

    <p>Yes, it depends on the pair of media involved.</p> Signup and view all the answers

    What is the phenomenon responsible for the change in the direction of light when it travels obliquely from one medium to another?

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

    In the activity with the coin at the bottom of a water-filled bucket, why was it difficult to pick up the coin in one go?

    <p>The coin appeared to be at a different depth due to refraction.</p> Signup and view all the answers

    What is the purpose of comparing experiences with friends in the coin activity?

    <p>To verify that the effect is consistent across different observers.</p> Signup and view all the answers

    What is the main topic discussed in the given text?

    <p>Reflection and refraction of light</p> Signup and view all the answers

    Which of the following statements about the nature of light is true?

    <p>Light is neither a wave nor a particle</p> Signup and view all the answers

    What is the first law of reflection mentioned in the text?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    Which of the following statements about the laws of reflection is correct?

    <p>The laws of reflection apply to all reflecting surfaces, including spherical surfaces</p> Signup and view all the answers

    What does the text imply about the formation of an image by a plane mirror?

    <p>The properties of the image formed by a plane mirror are well-known</p> Signup and view all the answers

    Based on the text, what can be inferred about the scope of the chapter?

    <p>The chapter covers both reflection and refraction of light</p> Signup and view all the answers

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