∵μ1=sinθc=53 ⇒μ=35 And v=μc=5/33×108=59×108=1.8×108 ms−1
NEET UG 2007 — Physics Optics
2007mcqhard
A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid? 
Official previous-year question
Held on 30 Apr 2007 · Verified 9 Jul 2026.
Options
- A
2.4×108 m/s
- B
3.0×108 m/s
- C
1.2×108 m/s
- D
1.8×108 m/s
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