7(b)
A ray of light travels from water to air as shown in the diagram given below:
(i) Copy the diagram and complete the path of the ray. Given the critical angle for water is 48°.
(ii) State the condition so that total internal reflection occurs in the above diagram.
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(i) Below diagram shows the path of the ray AO after reflection as OB:
(ii) For total internal reflection to occur, the angle of incidence i of incident ray AO must be more than 48° (i.e., angle i > 48 °)