Consider three media P , Q and R with refractive indices 1 , 1.25 and 1.5 respectively. The medium Q having a thickness of 5 cm is placed in between extended media P and R as shown in the figure. An object O is placed at the centre of medium Q . If viewed from medium P near the normal direction, the apparent depth of O is h 1 . For similar observation from medium R , the apparent depth is h 2 . The value of |h 1-h 2| , in cm, is:

1. A. 0
2. B. 1
3. C. 2
4. D. 3

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