Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than

Question

Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than (A) 30° (B) 60° (C) 45° (D) 90°

Tardigrade Admin · Accepted Answer

Total internal reflection occurs when theangle of incidence is greater than critical angle (C) in the denser medium.

^{1} μ_{2} = \frac{V e l oc i t yo f l i g h t inm e d i u m ’1’}{V e l oc i t yo f l i g h t inm e d i u m ’2’}

^{1} μ_{2} = \frac{v}{2 v} = \frac{1}{2} .

Medium ‘1’ is denser.
or

sin

C = \frac{1}{2}

= sin30

^{\circ}

or C = 30

^{\circ} .

Q. Light wave enters from medium $1$ to medium $2$ . Its velocity in $2^{n d}$ medium is double from $1^{s t}$ . For total internal reflection the angle of incidence must be greater than

30 $^{\circ}$

60 $^{\circ}$

45 $^{\circ}$

90 $^{\circ}$

Q. Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than

30∘

60∘

45∘

90∘

Total internal reflection occurs when theangle of incidence is greater than critical angle (C) in the denser medium. 1μ2​=Velocityoflightinmedium’2’Velocityoflightinmedium’1’​ 1μ2​=2vv​=21​. Medium ‘1’ is denser. or sin C=21​ = sin30∘ or C = 30∘.

Q. Light wave enters from medium $1$ to medium $2$ . Its velocity in $2^{n d}$ medium is double from $1^{s t}$ . For total internal reflection the angle of incidence must be greater than

30 $^{\circ}$

60 $^{\circ}$

45 $^{\circ}$

90 $^{\circ}$