Module 6

Question 1

The bending of light as it
passes obliquely from one
optical medium to another of
different refractive index.

Answer 1

REFRACTION

Question 2

The optical media must have
__refractive indices.

Answer 2

different

Question 3

The light must strike the
surface

Answer 3

obliquely

Question 4

The ratio of the velocity
of light in a given pair of
media

Answer 4

INDEX OF REFRACTION

Question 5

The ratio of the velocity of
light in vacuum to the
velocity of light in another
medium.

Answer 5

ABSOLUTE
REFRACTIVE INDEX

Question 5

The ratio of the velocity of light in the
first medium to the velocity of light
in the second medium.

Answer 5

RELATIVE
REFRACTIVE INDEX

Question 6

The incident ray and the refracted
ray lie in one plane at the point of
__ but on the opposite sides of
the normal to the surface.

Answer 6

incidence

Question 7

A constant ratio exists between the
sines of the angles of incidence and
refraction.

Answer 7

LAW # 2 SNELL’s LAW
(Willebrord Snell)

Question 8

A ray of light passing obliquely from
a rarer medium to a denser medium is
bent __ the normal to the
surface.

Answer 8

towards

Question 9

A ray of light passing obliquely from
a denser medium to a rarer medium is
bent__ from the normal to the
surface.

Answer 9

away

Question 10

A ray of light striking the surface
perpendicularly is __

Answer 10

UNDEVIATED

Question 11

An optical medium with
parallel – sided interfaces. (RECTANGULAR)

Answer 11

PLANE REFRACTOR

Question 12

the sideway displacement
of light ray after passing
through a plane refractor.

Answer 12

LATERAL DISPLACEMENT

Question 13

The distance by which the
object is apparently moved
towards or away from the
interface when the object
being viewed is located in
another medium.

Answer 13

APPARENT / LINEAR
DISPLACEMENT

Question 14

An angle of incidence at
the denser medium that yields
an angle of refraction of 90 ̊

Answer 14

CRITICAL ANGLE

Question 15

An optical phenomenon that
occurs if a ray of light is incident
on a surface separating an
optically dense from a less
optically dense medium at an
angle of incidence that is
considerably large.

Answer 15

TOTAL INTERNAL
REFLECTION

Question 16

an image formed by the reflection of
light at layers of air of different
temperature (ILLUSION)

Answer 16

MIRAGE

Question 17

seen over the
land

Answer 17

Inferior Mirage

Question 18

occasionally seen over the sea

Answer 18

Superior Mirage / Looming

Question 19

Technology of channeled
light transmission through
hair-like strand pure glass
known as optical fibers or
LIGHT PIPE.

Answer 19

FIBER OPTICS

Question 20

The procedure used by
medical doctors to examine
the internal organs of the
body.

Answer 20

ENDOSCOPY

Question 21

An optical device used in land
and in sea warfare, submarine
navigation, and elsewhere to
enable an observer see his
surroundings while remaining
under cover, behind armour, or
submerged in water.

Answer 21

PERISCOPE

Question 22

the boundary between two optical media.

Answer 22

Interface

Question 23

the light ray that is directed towards the surface

Answer 23

Incident Ray

Question 24

the point where the incident ray hits the interface.

Answer 24

Point of Incidence

Question 25

an imaginary line that passes thru the point of incidence and perpendicular to the interface.

Answer 25

Normal to the Surface

Question 26

the angle formed by the incident ray with the normal to the surface.

Answer 26

Angle of Incidence

Question 27

the light ray that leaves the surface, can be bent either towards or away from the surface.

Answer 27

Refracted Ray

Question 28

the angle formed by the incident ray with the normal to the surface.

Answer 28

Angle of Refraction