Start Free Mock LoginAlready registered? Login here

Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionMedium2 minQB

PhysicsMediumnumerical

Passage / Comprehension

A ray of light is incident normally on one face $3 0^{\circ} - 6 0^{\circ} - 9 0^{\circ}$ prism of refractive index $μ_{P} = \frac{5}{3}$ immersed in water of refractive index $μ_{m} = \frac{4}{3}$ as shown in the figure.\\

The minimum refractive index of surrounding medium so that total internal reflection at point P ceases is $\frac{n}{3}$ , find the value of n.

Answer:

2.50

Solution:

TIR at P ceases when $μ_{P} sin 6 0^{\circ} \leq n$ .

$n_{min} = \frac{5}{3} \times \frac{3}{2} = \frac{5}{2 3} = \frac{n}{3}$

$n = \frac{5}{2} = 2.50$

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:TIR/Prism and Dispersion

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...