LIGHT
NATURE OF LIGHT & SOURCES OF LIGHT
1) Newton
proposed ________ theory of light
Ans : corpuscles
2) Corpuscles are
_____ by the reflecting surface
Ans : repelled
3) Corpuscles are
______ by the refracting surface
Ans : attracted
4) Wave theory of
light was proposed by __________
Ans : Huygens
5) According to
Newton, the colours of light are due to
difference in the ______ of corpuscles.
Ans : different sizes
6) Light rays can
be produced from __________ body
Ans : luminous
7) Examples of
luminous bodies are _______
Ans: Sun, Stars
8) Maxwell
proposed _________ theory of light
Ans : electromagnetic
9) Light consists
of radiations called ________
Ans : photons
10) Light waves
are ________
Ans : transverse
11) In a ripple
tank , crest of the light wave, behaves as _____ lens
Ans : convex
12) In a ripple
tank the trough of light wave behaves as ______ lens
Ans : concave
13) In a ripple
tank _____ band is formed due to crests
Ans : bright
14) In a ripple
tank _____ band is formed due to troughs
Ans : dark
15) Speed of
light in vacuum is _________
Ans : 3 x 10 8 m/sec
Visual
Photometry:
1) The visual
light is an energy on the _______
Ans : flow
2) Example for
self luminous body is ________
Ans : Sun
3) Unit of luminous
flux is ________
Ans : Lumen
4) Sun light has
its maximum radiant energy close to ________
Ans: green light
LASER:
1)Laser stands for __________
Ans
: Light Amplification by Stimulated Emission of Radiation
2) The light used in destroying ICBM is in itself is __________
Ans
: Laser
3) First laser was called _________
Ans
: pulsed laser
4) The basic scientific principle behind a laser was put
forward by ________
Ans
: Dr. Charles
5) ICBM stands for _____
Ans
: Inter Continental Ballistic Missile
6) The property coherence in Laser is called ________
Ans
: temporal coherence
7) Lack of coherence makes ordinary light an ______
Ans
: optical noise
8) Coherence makes a laser light _____
Ans
: optical music
9) The important characteristic properties of laser are
________
Ans
: 1) coherence 2) directionality
3) monochromacity and high intensity
10) Example for monochromatic light is _______
Ans
: sodium lamp
11) Laser emits light only in one dirction. This is called _____ of laser light.
Ans:
directionality
12) The process of achieving population inversion is
called _________
Ans
: pumping ( It is a word used in Lasers)
13) The process of electrons being released on their own
from the excited states in atoms and emitting incoherent light is called
________
Ans
: spontaneous emission
14) _______ are used for bloodless surgery
Ans
: Lasers
15) Lasers are used now for __________
Ans
: drilling, cutting materials
16) Lasers are used in guided ______ and to deflect enemy
target
Ans
: missiles
17) Lasers employed in special 3-dimensional photography
are called _______
Ans
: Holography
18) The development of lasers which helped in
establishing a new revolutionary method of communications called __________
Ans
: fibre optic communication
19) The spread of wavelength about the maximum intensity
is called ______
Ans
: Band width
20) Ruby laser is an example for ______
Ans
: solid laser
21) Helium – Neon laser is an example for _______
Ans
: gaseous laser
22) The three dimensional photography is called _____
Ans
: Holography
23) The process of achieving “population inversion” is
called_____
Ans
: pumping
24) By ______ large energy can be concentrated into an
extremely small band width.
Ans
: Monochromacity
25) The light from an ordinary light source spreads out
uniformly in all directions and forms ______ wave fronts around it.
Ans
: spherical
No comments:
Post a Comment