On a sunny day you may see very bright lines formed on the bottom of a swimming pool. Why?
Absorption
Diffraction
Interference
Refraction
Light appears to travel in a straight line because
wavelength of light is vey small
frequency of light is very small
light consists of very small particles
velocity is different for different colours
In observing the diffraction pattern of a laser beam, you notice that the laser beam passes forward through a single slit with almost no spherical diffraction. What does this tell you about the wavelength of the laser with respect to the slit size?
the slit size is much smaller than the wavelength of light
this cannot be determined without knowing the distance from the slit to the screen
the slit size is almost exactly the same size as the wavelength of light
the slit size is much larger than the wavelength of light
One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, what is the path difference P1 - P2?
a whole number of half-wavelengths.
zero
an odd number of half-wavelengths
a whole number of wavelengths.
Which of the following is most correct? Corpuscular theory could not explain the phenomenon _______, ________ and __________.
reflection, interference, and diffraction
refraction, polarization, and diffraction
reflection, refraction and interference
interference, diffraction and polarization
On the basis of which technology does Solar cell work?
Laser technology
Photo-conduction
Thermal emission
Tyndall effect
In which unit is the Planck’s constant expressed?
Joule
Joule-hertz
Joule-second
Newton-second
Which of the following properties is a characteristic of the light waves from a laser?
The waves all have the same frequency
The waves are all in step with one another
The waves form a narrow beam
All of the above are true
What is the basis of the working of pyrometer?
In the which of the following is most true for incoherent light.
the light waves are emitted randomly.
the light waves are in step with one another.
the light is said to carry information.
many different frequencies interact with one another to form a multi-dimensional picture.
