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in Optics by (65 points)
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The angle between two mirror is 60o and is kept fixed. A ray is incident on one mirror at an angle 'i' as shown in figure . The angle 'i' is slowly increased from 0o to 90o. Net deviation suffered by the ray after two reflections is D. Which of the following plots for 'D' v/s 'i' is correct? (Answer ASAP)

                                                                                                                              

(1)                                (2) 

(3)                                 (4) 

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