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Find the angle of incidence of the ray s...

Find the angle of incidence of the ray shown in Fig. for which it passes through the pole, given that `MI|\|CP`.

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`/_ MlC = /_ CIP = theta`
`MI || CP /_ MI theta = /_ ICP = theta`
`CI = CP`
`/_ CIP = /_ CPI = theta`
`:.` In `Delta CIP` all angle are equal
`3 theta = 180^(@) rArr theta = 60^(@)`
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