Geometrical OpticsEasy
Question
A pendulum of length l is free to oscillate in vertical plane about point O in a medium of refractive index μ. An observer in air is viewing the bob of the pendulum directly from above. The pendulum is performing small oscillations about its equilibrium position. The equation of trajectory of bob as seen by observer is :
Options
A.x2 + y2 = l2
B.
C.
D.x2 + y2 = 
Solution
y =
........(i)x = x′ = l sin θ ...(ii)
from equation (i) & (ii)
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