EASY

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The _____ displacement of the emergent ray of light is the perpendicular distance between the original direction of the incident ray and the emergent ray coming out of the glass slab.

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Important Questions on Ray Optics

HARD

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A point source S is placed at the bottom of a transparent block of height 10 mm and refractive index 2.72. It is immersed in a lower refractive index liquid as shown in the figure. It is found that the light emerging from the block to the liquid forms a circular bright spot of diameter 11.54 mm on the top of the block. The refractive index of the liquid is

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EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A ray of light originates from inside a glass slab and is incident on its inner surface at an angle $θ$ as shown,

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In this experiment the location $x$ of the spot where they ray hits the screen is recorded. Which of the following correctly shown the plot of variation of $x$ with the angle $θ$ ?

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MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is

θ_{iC}

and Brewster's angle of incidence is

θ_{iB}

, such that

\frac{sin θ_{iC}}{sin θ_{iB}} = η = 1.28

. The relative refractive index of the two media is

HARD

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A monochromatic light is incident from air on a refracting surface of a prism of angle

75^{o}

and refractive index

n_{0} = \sqrt{3} .

The other refracting surface of a prism is coated by a thin film of material of refractive index

n

as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of

θ \leq 60^{o} .

The value of

n^{2}

is_______.

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MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A green light is incident from the water to the air - water interface at the critical angle

(θ_{c})

. Select the correct statement.

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

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 angle of refraction?

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A diver looking up through the water sees the outside world contained in a circular horizon. The refractive index of water is

\frac{4}{3}

, and the diver's eyes are

15 cm

below the surface of the water. Then the radius of the circle is :

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

There is a small source of light at some depth below the surface of water (refractive index

= \frac{4}{3}

) in a tank of large cross sectional surface area. Neglecting any reflection from the bottom and absorption by water, percentage of light that emerges out of surface is (nearly):
[Use the fact that surface area of a spherical cap of height

h

and radius of curvature

r

2 π r h

]

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A travelling microscope is focused on an ink dot. When a glass slab (

n = 1.5

) of thickness

9 cm

is introduced on the dot, the travelling microscope has to be moved by

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

An air bubble in a glass slab with refractive index

1.5

(near-normal incidence) is

5 cm

deep when viewed from one surface and

3 cm

deep when viewed from the opposite face. The thickness (in

cm

) of the slab is

HARD

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A transparent cube of side

d

, made of a material of refractive index

μ_{2}

, is immersed in a liquid of refractive index

μ_{1} (μ_{1} < μ_{2})

. A ray is incident on the face

A B

at an angle

θ

(shown in the figure). Total internal reflection takes place at the point

E

on the face

B C .

Then,

θ

must satisfy

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A ray of light is incident normally on a glass slab of thickness

5 cm

and refractive index

1.6

. The time taken to travel by a ray from source to surface of the slab is the same as to travel through glass slab. The distance of the source from the surface is

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

The critical angle for light going from medium

x

to medium

y

θ

. The speed of light in medium

x

v_{x}

. The speed of light in medium

y

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

Pick the wrong answer in the context with rainbow.

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

The critical angle of a medium for a specific wavelength, if the medium has relative permittivity

3

and relative permeability

\frac{4}{3}

for this wavelength, will be:

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. Write necessary angles.

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EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

Define critical angle.

MEDIUM

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A ray of light incident on a transparent sphere at an angle

\frac{π}{4}

and refracted at an angle

r

, emerges from the sphere after suffering one internal reflection. The total angle of deviation of the ray is

HARD

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A beam of light consisting of red, green and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are

1.39

1.44

and

1.47

respectively.

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The prism will:

EASY

Physics>Optics>Ray Optics>Refraction of Light at Plane Surface

A glass slab of thickness

4 cm

contains the same number of waves as in

x cm

of water column when both are traversed by the same monochromatic light. If the refractive indices of glass and water for that light are

\frac{5}{3}

and

\frac{4}{3}

respectively, the value of

x

will be

The _____ displacement of the emergent ray of light is the perpendicular distance between the original direction of the incident ray and the emergent ray coming out of the glass slab.

Important Questions on Ray Optics

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