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The graph which represents the relation between refractive index $μ$ with wavelength $λ$ is

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Important Questions on Ray Optics

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Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

Which of the following graphs shows appropriate variation of refractive index

μ

with wavelength

λ

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

If the refractive index of water is

1.33

, the speed of light in water will be

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

The difference of speed of light in the two media

A

and

B (v_{A} - v_{B})

2.6 \times 10^{7} m s^{- 1}

. If the refractive index of medium

B

1.47

, then the ratio of refractive index of medium

B

to medium

A

is: (Given : speed of light in vacuum

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

)

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

Which of the following statements is FALSE?

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Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

The wavelength of blue light

(λ = 420 nm)

in water (refractive index

1.33

) is about

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

Which one of the following physical quantities does not have unit?

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

Light of wavelength

5000 \overset{o}{A}

in air has wavelength in glass

(μ = 1.5)

equal to:

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

The INCORRECT statement is

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Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

A horizontal parallel beam of light passes through a vertical convex lens of focal length,

20 cm

and is then reflected by a tilted plane mirror so that it converges to a point

I

. The distance

P I

10 cm

M

is a point at which the axis of the lens intersects the mirror. The distance

P M

10 cm

. The angle which the mirror makes with the horizontal is,

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

White light with uniform intensity across the visible wavelength range of

400 nm

800 nm

is incident almost perpendicularly from above onto a horizontal liquid film of refractive index

1.25

and of thickness

300 nm

. The medium on both sides of the film is air. The wavelength of light reflected by the film which appears brightest to an observer seeing it from the top is close to

HARD

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

A girls sees through a circular glass slab (refractive index

1.5

) of thickness

20 mm

and diameter

60 cm

to the bottom of a swimming pool. The refractive index of water is

1.33

. The bottom surface of the slab is in contact with the water surface.
Question Image

The depth of the swimming pool is

6 m

. The area of the bottom of the swimming pool that can be seen through the slab is approximate-

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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

HARD

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

A cubical vessel has opaque walls. An observer (dark circle in the figure below) is located, such that she can see only the wall, $C D$ , but not the bottom. Nearly to what height should water be poured, so that she can see an object placed at the bottom at a distance of, $10 cm$ , from the corner, $C$ ? Refractive index of water is, $1.33$ .

Question Image

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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,

EASY

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

Choose the wrong statement.

MEDIUM

Physics>Optics>Ray Optics>Refraction at Plane and Spherical Surfaces

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:

The graph which represents the relation between refractive index μ with wavelength λ is

Important Questions on Ray Optics

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The graph which represents the relation between refractive index $μ$ with wavelength $λ$ is