14 (a) Define critical angle.                                                               

1. Crown has a refractive index of 1.55. Determine its critical angle. (3 marks)

1. A ray of light strikes the crown prism in (b) above as shown below.

Trace the path of the ray till it emerges (show your work above) (3 marks)

1. Using a well-labeled diagram, show how you would use a converging lens as a simple microscope (3 marks)

1. 
   

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