Light MCQ 3
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Questions and Answers

What is the ratio involved in Snell's Law for two given media?

  • Sine of the angle of incidence to the sine of the angle of refraction (correct)
  • Tangent of the angle of incidence to the cosine of the angle of refraction
  • Sine of the angle of incidence to the cosine of the angle of refraction
  • Cosine of the angle of incidence to the sine of the angle of refraction

    • What type of images do concave lenses always produce?

  • Inverted images
  • Virtual images (correct)
  • Enlarged images
  • Real images

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

  • It refracts towards normal
  • It scatters randomly
  • It refracts away from normal (correct)
  • It reflects internally

    • What is the critical angle defined as?

    <p>Angle where total internal reflection occurs</p> Signup and view all the answers

    What is the formula used to calculate focal length for lenses?

    <p>None of the above</p> Signup and view all the answers

    What is the power of a lens equal to?

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

    What does the refractive index (n) represent?

    <p>$\frac{\text{velocity in medium 1}}{\text{velocity in medium 2}}$</p> Signup and view all the answers

    What is the principle behind the working of optical fibres?

    <p>Refraction and total internal reflection</p> Signup and view all the answers

    Which law states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for two given media?

    <p>Snells Law</p> Signup and view all the answers

    In a converging system in the human eye, which part plays a role alongside the lens?

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

    Study Notes

    Refraction

    • Refraction is the bending of a ray of light when it goes from one medium to another.
    • The incidence ray, normal, and refracted ray are all in the same plane.
    • The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for two given media (Snell's Law).

    Optical Fibre

    • An optical fibre is a very thin transparent rod (usually of glass) through which light can travel by total internal reflection.
    • Refractive index (n) is equal to real depth divided by apparent depth, or velocity in medium 1 divided by velocity in medium 2.

    Laws of Refraction

    • Light going from a denser to a rarer medium is refracted towards the normal.
    • Light going from a rarer to a denser medium is refracted away from the normal.
    • Critical angle is the angle of incidence whose corresponding angle of refraction is 90 degrees.

    Lenses

    • There are two types of lenses: concave (diverging) and convex (converging).
    • Concave lenses produce Virtual images.
    • Convex lenses produce Real and Virtual images.
    • The formula 1/f = 1/u + 1/v is used to calculate focal length (f), object distance (u), and image distance (v).
    • Power of a lens is equal to 1/f.
    • The human eye uses a lens which, alongside the cornea, produces a converging system.

    Additional Notes

    • 1/f is a minus for a diverging lens.
    • 1/v is minus for a virtual image.
    • P = P1 + P2, where P1 and P2 are powers of the two lenses in contact.

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