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3 marksRefraction

CSEC Physics · January 2015 · Paper 2 · Question 4(b)(i)

A pencil is placed in a glass of water and appears to be bent as shown in Figure 3.

Calculate the refractive index of the water which causes this apparent bending if angle a = 32° and angle b = 45°.

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Other parts of this question

  1. 4(a)(i)With the aid of a labelled diagram, state the laws of reflection.[4 marks]
  2. 4(a)(ii)The glare of light from oncoming vehicles when driving on rainy nights can be annoying. With the aid of a labelled diagram, show how this glare results.[2 marks]
  3. 4(b)(ii)If the pencil is now placed in ethanol with a refractive index of 1.36, calculate the new angle b given that angle a in the ethanol remains at 32°.[4 marks]
  4. 4(b)(iii)Does the pencil bend more or less in ethanol than in water? Justify your answer.[2 marks]

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