A ray of light wavelength λ 0 and frequency v 0 enters a glass slab of refractive index μ from air. Then,

Δ λ = λ 0 1 μ - 1 and Δ v ⁡ = 0

Its wavelength increases, frequency decreases

Its wavelength increases, frequency remains same

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A ray of light passes through four transparent media with refractive indices $μ_{1}$ , $μ_{2}$ , $μ_{3}$ and $μ_{4}$ as shown in the figure. The surfaces of all media are parallel . If the emergent ray CD is a parallel to the incident ray AB , were must have

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Important Questions on Light

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Science>Physics>Light>Refractive Index

When a plane electromagnetic wave enters a glass slab, then which of the following will not change?

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Science>Physics>Light>Refractive Index

When light enters glass from vacuum, then the wavelength of light

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Science>Physics>Light>Refractive Index

Consider a glass cube slab of dielectric bound by the planes

x = 0, x = a; y = 0, y = b; z = 0, z = c;

with

b > a > c .

The slab is placed in air and has a refractive index of

n .

The minimum value for

n

, such that all rays entering the dielectric at

y = 0

reach

y = b

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Science>Physics>Light>Refractive Index

The image of an object placed in air formed by a convex refracting surface is at a distance of

10 m

behind the surface. The image is real and is at

\frac{2^{r d}}{3}

of the distance of the object from the surface. The wavelength of light inside the surface is

\frac{2}{3}

times the wavelength in air. The radius of the curved surface is

\frac{x}{13} m

, the value of

x

is ______ .

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

1.5 .

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:

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Science>Physics>Light>Refractive Index

A monochromatic beam of light passing through water (refractive index

= 4 / 3

) has wavelength

5400 Å .

When it is refracted in glass (refractive index

= 3 / 2

) its wavelength will be

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The reflected ray is completely polarized for certain angle of incidence in a transparent medium. If the angle of refraction is

30 °,

then the refractive index of the medium is

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Science>Physics>Light>Refractive Index

Light of wavelength

300 nm

in medium

A

enters into medium

B

through a plane surface. If the frequency of light is

5 \times 10^{14} Hz

and the ratio of speed in medium

A

to that is medium

B

\frac{4}{5}

, the absolute refractive index of medium

B

is,

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Science>Physics>Light>Refractive Index

A ray of light wavelength

λ_{0}

and frequency v₀ enters a glass slab of refractive index

μ

from air. Then,

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The angle of a prism is ‘

A

’. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence

2 A

on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index

μ,

of the prism is:

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A ray of light strikes a glass plate at an angle of

60 °

. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is

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Let the refractive index of a denser medium with respect to rarer medium be

n_{12}

and its critical angle be

θ_{C}

. At an angle of incidence

A

when light is travelling from denser medium to rarer medium, a part of the light is reflected and the rest is refracted and the angle between reflected and refracted rays is

90^{o}

. Angle

A

is given by

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Science>Physics>Light>Refractive Index

The wavelength of a light coming from a sodium source is

645 nm

. What will be its wavelength in water, if the refractive index of water is

1.33 ?

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Science>Physics>Light>Refractive Index

Light of wavelength

5000 \overset{o}{A}

in air has wavelength in glass

(μ = 1.5)

equal to:

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Find the value of the angle of emergence from the prism. Refractive index of the glass is $\sqrt{3}$ .

Question Image

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Science>Physics>Light>Refractive Index

Which of the following graphs shows appropriate variation of refractive index

μ

with wavelength

λ

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Blue light travelling in a vacuum has a wavelength of

450 nm .

It enters a medium whose refractive index is

1.5 .

What is its frequency in the medium?
(Speed of light in vacuum

= 3 \times 10^{8} m s^{- 1}

)

HARD

Science>Physics>Light>Refractive Index

A ray of light

A O

in vacuum is incident on a glass slab at angle

60 °

and refracted at angle

30 °

along

O B

as shown in the figure. The optical path length of light ray from

A

B

is:

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Science>Physics>Light>Refractive Index

Electromagnetic waves emanating from a point $A$ (in air) are incident on a rectangular block of material $M$ and emerge from the other side as shown below. The angles $i$ and $r$ are angles of incidence and refraction when the wave travels from air to the medium. Such paths for the rays are possible,

Question Image

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Science>Physics>Light>Refractive Index

When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness

6 cm

is same as in water column of height

7 cm

. If refractive index of glass is

1.5

then refractive index of water is

A ray of light passes through four transparent media with refractive indices μ1, μ2,μ3 and μ4 as shown in the figure. The surfaces of all media are parallel . If the emergent ray CD is a parallel to the incident ray AB , were must have

Important Questions on Light

Learn and Prepare for any exam you want !

A ray of light passes through four transparent media with refractive indices $μ_{1}$ , $μ_{2}$ , $μ_{3}$ and $μ_{4}$ as shown in the figure. The surfaces of all media are parallel . If the emergent ray CD is a parallel to the incident ray AB , were must have