In total internal reflection, when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be the angle of refraction?

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Important Questions on Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre

EASY

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 2 - Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 20

Pick the wrong answer in the context with rainbow.

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 2 - Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 21

A light wave is incident normally on a glass slab of refractive index

1.5

. If

4 %

of light gets reflected and the amplitude of the electric field of the incident light is

30 \frac{V}{m}

, then the amplitude of the electric field for the wave propagating in the glass medium will be:

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 2 - Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 22

A concave mirror has a radius of curvature of $40 cm$ . It is at the bottom of a glass that has water filled up to $5 cm$ (see figure). If a small particle is floating on the surface of the water, its image as seen, from directly above the glass, is at a distance d from the surface of the water. The value of d is close to: (Refractive index of water $= 1.33$ )

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MEDIUM

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 2 - Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 1

A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of

45 °

. The ray undergoes total internal reflection. If

n

is the refractive index of the medium with respect to air, select the possible value(s) of

n

from the following:

HARD

12th ICSE

IMPORTANT

ISC Physics Class 12, Part-2>Chapter 2 - Refraction of Light at a Plane Interface : Total Internal Reflection : Optical Fibre>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 2

A transparent slab of thickness d has a refractive index $n (z)$ that increases with $z$ . Here $z$ is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices $n_{1}$ and $n_{2} (> n_{1})$ , as shown in the figure. A ray of light is incident with angle $θ_{i}$ from medium $1$ and emerges in medium $2$ with refraction angle $θ_{f}$ with a lateral displacement $l$ .