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.
Related questions
Blue sky seen through a rotating polaroid rises and falls in brightness. Sky light is:Two polaroids are set crossed. The light passing through both is:Ordinary lamp light passes through one polaroid. Its intensity drops to:Wiggle a string up and down and a wave runs along it. The displacement is at right angles The rainbow of colours you see on a CD comes from:Diffraction is shown by:Near the edge of a shadow you see alternate dark and bright bands. This is:In Young's pattern, consecutive bright fringes are: