A glass slab of width \( t \) , refractive index \( \mu \) is placed as shown in the figure. ...

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A glass slab of width \( t \) , refractive index \( \mu \) is placed as shown in the figure. If the point object, moves with a speed \( 2 \mathrm{~cm} / \mathrm{s} \) towards the slab the speed observed will be
(a) \( 2 \mathrm{~cm} / \mathrm{s} \)
(b) Less than \( 2 \mathrm{~cm} / \mathrm{s} \)
(c) Greater than \( 2 \mathrm{~cm} / \mathrm{s} \)
(d) Dependent on the refractive index of surrounding medium
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