10. (a) (i) Distinguish between pole and center of curvature of a spherical mirror. (ii) Describe how the approximate focal length of a concave mirror could be determined. [4 marks] (b) A concave mirror of focal length 10 cm forms a magnified image on a screen 15 cm from the object. Calculate the image distance. [4 marks] (c) A spot at the bottom of a vessel of uniform cross-sectional area 10 cm² filled with alcohol of volume 75 cm³ appeared to be displaced by 2 cm when viewed vertically at the top. Calculate the refractive index of the alcohol. [4 marks] (d) Explain why the pitch of the sound produced by a guitar increases when its string is tightened. [3 marks]
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It is usually denoted by the letter 'P'. The center of curvature of a spherical mirror is the center of the sphere from which the mirror is made. It is denoted by the letter 'C'. (ii) The approximate focal length of a concave mirror can be determined by focusing Show more…
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