Physics Quiz: Lenses and Optical Fibres
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Questions and Answers

What is the angle of incidence of the ray of light on the prism?

  • 60 (correct)
  • 120
  • 30
  • 90

What is the purpose of a p-n junction diode?

  • To convert AC to DC
  • To control the flow of current (correct)
  • To decrease electrical conductivity
  • To increase electrical conductivity

What is the type of material used in semiconductors?

  • Conductor
  • Insulator
  • Semiconductor (correct)
  • Superconductor

What is the principle behind the working of an optical fibre?

<p>Total internal reflection (A)</p> Signup and view all the answers

What is the angle of deviation of the ray of light as it passes through the prism?

<p>60 (C)</p> Signup and view all the answers

What is the function of the lens L1 in the given diagram?

<p>To form a real image (B)</p> Signup and view all the answers

What is the purpose of an astronomical refracting telescope?

<p>To form an image at infinity (A)</p> Signup and view all the answers

What is the SI unit of electrical conductivity of a wire?

<p>Siemens per meter (B)</p> Signup and view all the answers

What can be said about the internal resistance of a high-voltage battery compared to a low-voltage battery?

<p>It is higher in a high-voltage battery (D)</p> Signup and view all the answers

What is the focal length of lens L1 in the given diagram?

<p>24 cm (D)</p> Signup and view all the answers

What is the total energy supplied by the batteries to the circuit in one minute?

<p>Cannot be determined from the given information (D)</p> Signup and view all the answers

What is the purpose of using a concave lens L2 in the given diagram?

<p>To correct the chromatic aberration of lens L1 (B)</p> Signup and view all the answers

What is the relationship between the refractive index of a lens material and the wavelength of light used?

<p>The refractive index increases with increasing wavelength (C)</p> Signup and view all the answers

What is the effect of increasing the wavelength of light on the power of a lens?

<p>The power of the lens decreases with increasing wavelength (B)</p> Signup and view all the answers

What is the condition for the focal length of a convex lens to be equal to its radius of curvature?

<p>The refractive index of the material is equal to 2 (B)</p> Signup and view all the answers

What is the orientation of the dipole moment and the electric field in the given problem?

<p>The dipole moment and the electric field are parallel (C)</p> Signup and view all the answers

What is the formula related to the design of lenses of desired focal lengths?

<p>Lensmaker's formula (A)</p> Signup and view all the answers

What is the condition for an electric dipole to have maximum potential energy in a uniform electric field?

<p>The dipole moment is antiparallel to the electric field (A)</p> Signup and view all the answers

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