Refraction of Light
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Questions and Answers

What is the order of colors produced when sunlight passes through a prism?

  • Red, yellow, blue, green, orange, indigo, violet
  • Violet, indigo, blue, green, yellow, orange, red (correct)
  • Green, yellow, red, orange, blue, violet, indigo
  • Orange, red, yellow, green, blue, violet, indigo

    • What will happen if a circular disc painted with seven colors is rotated rapidly?

  • It will appear white (correct)
  • It will appear black
  • It will appear colorful
  • It will lose all color

    • Which type of mirror has the reflective surface on the inner part?

  • Flat mirror
  • Concave mirror (correct)
  • Convex mirror
  • Plane mirror

    • What does the pole of a spherical mirror represent?

    <p>The midpoint of the aperture of the mirror</p> Signup and view all the answers

    What is the radius of curvature in the context of a spherical mirror?

    <p>The radius of the sphere of which the mirror is a part</p> Signup and view all the answers

    How is a convex mirror made?

    <p>By silvering the inner convex surface</p> Signup and view all the answers

    Which term describes the center of curvature of a mirror?

    <p>It is the center of the sphere of the mirror</p> Signup and view all the answers

    What is the principal axis of a spherical mirror?

    <p>A straight line joining the pole to its center of curvature</p> Signup and view all the answers

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

    <p>It bends towards the normal.</p> Signup and view all the answers

    What is the speed of light in water?

    <p>$2.25 × 10^8 ext{ m/s}$</p> Signup and view all the answers

    What type of ray is referred to as the refracted ray?

    <p>The ray traveling in the new medium at a different angle.</p> Signup and view all the answers

    How does the speed of light in glass compare to the speed of light in air?

    <p>Light travels slower in glass than in air.</p> Signup and view all the answers

    What occurs when light hits the surface separating two media perpendicularly?

    <p>It passes without deviating.</p> Signup and view all the answers

    What is an incident ray?

    <p>The ray of light falling on the surface separating two media.</p> Signup and view all the answers

    In optical density, what does it mean if a medium has a slower speed of light?

    <p>The medium is denser.</p> Signup and view all the answers

    What is the radius of curvature in the context of curved mirrors?

    <p>The distance from the mirror surface to the center of curvature.</p> Signup and view all the answers

    What type of image is formed by a concave mirror when the object is placed very close to it?

    <p>Virtual and magnified</p> Signup and view all the answers

    When the object is at the centre of curvature of a concave mirror, what is the nature of the image formed?

    <p>Real, inverted, and of same size</p> Signup and view all the answers

    What happens to the image when the object is placed at focus or beyond it in a concave mirror?

    <p>Image is real and inverted</p> Signup and view all the answers

    In what situation is the image formed by a concave mirror virtual, erect, and enlarged?

    <p>When the object is between the focus and pole</p> Signup and view all the answers

    What type of images are formed by convex mirrors regardless of the object's position?

    <p>Virtual and erect</p> Signup and view all the answers

    What type of image is always formed by a convex mirror?

    <p>Virtual and erect</p> Signup and view all the answers

    When an object is placed at infinity in front of a concave mirror, where is the image formed?

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

    As an object approaches a convex mirror, what happens to the size of the image?

    <p>It diminishes but remains smaller than the object</p> Signup and view all the answers

    What characteristic does the image formed by a mirror exhibit?

    <p>It shows lateral inversion</p> Signup and view all the answers

    Where is the virtual image formed by a convex mirror located?

    <p>Between the focus and the pole</p> Signup and view all the answers

    What is the nature of the image when the object is placed beyond the centre of curvature in a concave mirror?

    <p>Real and smaller</p> Signup and view all the answers

    What is the nature of the image formed when the object is at the center of curvature in a concave mirror?

    <p>Real, inverted and of the same size as the object</p> Signup and view all the answers

    What happens to the image in a concave mirror when the object is moved closer than the focus?

    <p>The image becomes virtual and enlarged</p> Signup and view all the answers

    Which of the following describes the image formed by a concave mirror when the object is at infinity?

    <p>It is real and diminishes to a point</p> Signup and view all the answers

    Which statement correctly identifies the relationship between object position and image size for convex mirrors?

    <p>The image size increases as the object approaches</p> Signup and view all the answers

    What happens to the virtual image when the object is moved towards a convex mirror?

    <p>It moves towards the pole of the mirror</p> Signup and view all the answers

    What do the laws of reflection state about the angle of incidence and the angle of reflection?

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

    What is the focus of a concave mirror?

    <p>It is where the reflected rays converge at.</p> Signup and view all the answers

    In a convex mirror, how do the reflected rays behave?

    <p>They diverge and appear to come from a point behind the mirror.</p> Signup and view all the answers

    How is the focal length of a mirror defined?

    <p>The distance from the pole of the mirror to the focus.</p> Signup and view all the answers

    What relationship exists between focal length and radius of curvature?

    <p>Focal length = Radius of curvature/2.</p> Signup and view all the answers

    What is the result of using paper to find the focal length of a concave mirror while facing the sun?

    <p>A small image of the sun will be projected onto the paper.</p> Signup and view all the answers

    Which of the following is true regarding ray diagrams in spherical mirrors?

    <p>The object is positioned perpendicular to the principal axis.</p> Signup and view all the answers

    Which of the following statements is true about the behavior of light rays on a spherical mirror?

    <p>Reflected rays from a concave mirror converge at a focus.</p> Signup and view all the answers

    What is the angle of incidence defined as?

    <p>The angle between the incident ray and the normal</p> Signup and view all the answers

    What does the refractive index (μ) represent?

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

    According to Snell's law, the incident ray, the normal, and the refracted ray:

    <p>Lie in the same plane</p> Signup and view all the answers

    If a ray travels from air to water, what happens to its path?

    <p>It bends towards the normal</p> Signup and view all the answers

    What phenomenon causes the depth of a vessel containing water to appear less when viewed from air?

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

    What is the refractive index of air?

    <p>1</p> Signup and view all the answers

    When light travels from air to glass, what is the calculated refractive index?

    <p>1.5</p> Signup and view all the answers

    Which of the following statements is true regarding refraction?

    <p>The speed of light decreases when it travels from a denser to a rarer medium.</p> Signup and view all the answers

    Study Notes

    Refraction of Light

    • Light travels in a straight line in a medium
    • Refraction is the change in the direction of the path of light when it passes from one optically transparent medium to another.
    • When light travels from a rarer medium to a denser medium it bends toward the normal.
    • When light travels from a denser medium to a rarer medium it bends away from the normal.
    • When light falls normally on the surface separating two media, it passes undeviated.

    Speed of Light in Different Media

    • Light travels faster in air than in water or glass.
    • Speed of light in air is 3 x 10⁸ m/s
    • Speed of light in water is 2.25 x 10⁸ m/s
    • Speed of light in glass is 2 x 10⁸ m/s
    • A medium is denser if the speed of light decreases in it
    • A medium is rarer if the speed of light increases in it
    • The speed of light can't be greater than 3 x 10⁸ m/s in any medium
    • Incident ray: The ray of light that falls on the surface separating two media
    • Refracted ray: The ray of light that travels in the other medium after changing direction
    • Normal: A perpendicular drawn at the point where the incident ray strikes the surface separating two media.
    • Angle of incidence: The angle between the incident ray and the normal
    • Angle of refraction: The angle between the refracted ray and the normal

    Laws of Refraction (Snell's Law)

    • The angle of incidence i and the angle of refraction r are related by a constant, called the refractive index.
    • The refractive index of medium two with respect to medium one is: µ = sin i / sin r
    • e.g., for air to water, µ = 4/3.

    Apparent Depth

    • The depth of water in a vessel appears less when viewed from the air above.
    • Real depth / Apparent depth = Refractive Index

    Mirage in a Desert

    • In deserts, the sand is hotter during the day so the air near the ground becomes warmer and rarer.
    • The temperature difference creates layers of differing densities in the air. This causes light from distant objects to bend. This often creates a false impression of water.

    Dispersion of White Light

    • White light is a mixture of seven colours
    • Violet, Indigo, Blue, Green, Yellow, Orange, Red
    • The refractive index for each colour is slightly different when traveling through a medium
    • This creates the spectrum that is seen when white light passes through a prism

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    Refraction of Light PDF

    Description

    This quiz covers the concepts of refraction, including how light interacts with different media and its speed in various substances. Test your understanding of how light bends and travels through air, water, and glass. Explore the key terms associated with these phenomena.

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