The optical path of a 3 cm ray in flint glass (n = 1.6) equals that of an unknown medium (n = 1.25) over distance $x$. Then $x$ is:
A3.0 cm
B3.84 cm
C2.34 cm
D4.8 cm
Answer & Solution
Correct answer: B. 3.84 cm
Optical path = $n \cdot $ geometric path. So $1.6 \times 3 = 1.25 \times x$ ⇒ $x = 4.8/1.25 = 3.84$ cm.
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