WPH12Topic 2.34 questions
Refractive index and Snell's law, critical angle and total internal reflection, plane polarisation and pulse-echo techniques.
Know and understand that at the interface between medium 1 and medium 2, , where refractive index is
Be able to calculate the critical angle using
Be able to predict whether total internal reflection will occur at an interface
Understand how to measure the refractive index of a solid material
Understand what is meant by plane polarisation
Understand that waves can be transmitted and reflected at an interface between media
Understand how a pulse-echo technique can provide information about the position of an object and how the amount of information obtained may be limited by the wavelength of the radiation or by the duration of pulses
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Original practice questions written in the style of the exam.
A ray of light in air strikes the surface of water at an angle of incidence of . The refractive index of water is .
(a) Calculate the angle of refraction.
(b) Calculate the speed of light in water.
An object is placed from a thin converging lens of focal length . Use the real-is-positive convention.
(a) Calculate the power of the lens.
(b) Calculate the image distance and state whether the image is real or virtual.
(c) Calculate the linear magnification.