| 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 cm/sec towards the slab the observed speed by the observer will be : |
 |
A) 2 cm/sec
B) less than 2 cm/sec
C) greater than 2 cm/sec
D) \[(2/\mu )\] cm/sec
Correct Answer: A
Solution :
| [a] |
 |
| If \[\frac{dx}{dt}=2\] |
| \[\frac{dy}{dt}=2\] |
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