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18 Questions

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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

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?

Total internal reflection Signup and view all the answers

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

60 Signup and view all the answers

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

To form a real image Signup and view all the answers

What is the purpose of an astronomical refracting telescope?

To form an image at infinity Signup and view all the answers

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

Siemens per meter 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?

It is higher in a high-voltage battery Signup and view all the answers

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

24 cm Signup and view all the answers

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

Cannot be determined from the given information Signup and view all the answers

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

To correct the chromatic aberration of lens L1 Signup and view all the answers

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

The refractive index increases with increasing wavelength Signup and view all the answers

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

The power of the lens decreases with increasing wavelength 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?

The refractive index of the material is equal to 2 Signup and view all the answers

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

The dipole moment and the electric field are parallel Signup and view all the answers

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

Lensmaker's formula Signup and view all the answers

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

The dipole moment is antiparallel to the electric field Signup and view all the answers