A vertical pencil rays comes from bottom of a tank filled with a liquid. When tank is accelerated with acceleration of 7.5 m/s 2 the ray is seen to be just totally reflected by liquid surface. What is true about refractive index of liquid i.e. about μ -
A
μ slightly greater than 
B
μ slightly greater than 
C
μ slightly greater than 1.5
D
μ slightly greater than 1.75
Text Solution
Verified by ExpertsThe correct answer is:
B
F 1 – F 2 = ma
ρ g [h 1 – h 2 ] × A = a × ρ A L
tan θ = 
= 
θ > θ c [Total internal reflection]
tan θ > tan θ c
> tan θ c
sin θ = 
> 
9 ( μ 2 – 1) > 16
9 μ 2 > 16 + 9
μ > 
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