Chapter 5: Q2DQ (page 1151)
For the situation shown in Fig. 34.3, is the image distance s′ positive or negative? Is the image real or virtual? Explain your answers
The image will be virtual and erect
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In a diffraction experiment with waves of wavelength ,there will be no intensity minima (that is, no dark fringes) if the slit width is small enough. What is the maximum slit width for which this occurs? Explain your answer.
If we shine white light on an air wedge like that shown in Fig. 35.12, the colours that are weak in the light reflected from any point along the wedge are strong in the light transmitted through the wedge. Explain why this should be so.
Two small stereo speakers A and B that are 1.40 m apart are sending out sound of wavelength 34 cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks so that he is always 1.50 m from speaker B (Fig. E35.1). For what values of x will the sound this person hears be (a) maximally reinforced, (b) cancelled? Limit your solution to the cases where x 1.50 m.
A very thin soap film (n = 1.33), whose thickness is much less than a wavelength of visible light, looks black; it appears to reflect no light at all. Why? By contrast, an equally thin layer of soapy water (n = 1.33) on glass (n = 1.50) appears quite shiny. Why is there a difference?
The image of a tree just covers the length of a plane mirror tall when the mirror is held 35cm from the eye. The tree is 28m from the mirror. What is its height?
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