CBSE Questions for Class 12 Medical Physics Wave Optics Quiz 3 - MCQExams.com

The transverse nature of light is shown by
  • interference of light
  • refraction of light
  • polarization of light
  • dispersion of light
Albert Einstein used corpuscular theory to explain :
  • $$E=mc^2$$
  • The photoelectric effect
  • Quantisation of charge
  • magic of light
Who amongst the following used corpuscular theory to explain the nature of light?
  • Max Planck
  • Newton
  • Young
  • Einstein
Who first proposed that light was wave-like in character ?
  • Huygens
  • Newton
  • Young
  • Maxwell
In which of the following the final image is erect? 
  • Compound microscope
  • Astronomical telescope
  • Simple microscope
  • All of the above
Two lenses of focal lengths $$+ 100 cm$$ and $$+ 5 cm$$ are used to prepare an astronomical telescope. The minimum tube length will be : (final image is at $$\displaystyle \infty $$)
  • $$95 cm$$
  • $$100 cm$$
  • $$105 cm$$
  • $$500 cm$$
In optical instruments, the lenses are used to form images by :
  • Reflection
  • Refraction
  • Dispersion
  • Scattering
When light falls on matter, it can produce :
  • mechanical effect
  • chemical effect
  • heating effect
  • all the above
During the $$19th$$ century, light was considered to be a stream of particles called :
  • atoms
  • electrons
  • corpuscles
  • quantas
Corpuscular theory of light was advanced by
  • Huygen
  • Newton
  • Maxwell
  • Hertz
The speed at which the current travels in a conductor, is nearly.
  • $$3 \times 10^4 ms^{-1}$$
  • $$3 \times 10^5 ms^{-1}$$
  • $$4 \times 10^6 ms^{-1}$$
  • $$3 \times 10^8 ms^{-1}$$
Which of the following statement is true ?
  • Sound waves, not light waves, bend around obstacles
  • Light waves, not sound waves, bend around obstacles
  • Both light and sound waves bend around obstacles
  • Neither sound waves nor light waves bend around obstacles
  • None of the above
Two coherent sources of light can be obtained by
  • two different lamps
  • two different lams of same power and same colour
  • two different lamps of same power
  • none of these
Two light sources are said to be coherent if they are obtained from:
  • two ordinary bulbs emitting light of different wavelengths
  • a single point source
  • a wide source
  • two independent point sources emitting light of the same wavelength
When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to :
  • dispersion
  • diffraction
  • interference
  • refraction
In a simple slit diffraction pattern intensity and width of fringes are
  • Unequal width
  • Equal width
  • Equal width and equal intensity
  • Unequal width and unequal intensity
The path difference produced by two waves is $$3.75\mu m$$ and the wavelength is $$5000  \mathring { A } $$. The point is
  • Uncertain
  • Dark
  • Partially bright
  • Bright
The bending of light near the edges of an obstacle and spreading into the region of geometrical shadow is called ___________.
  • Interference
  • Diffraction
  • Polarization
  • Doppler effect
The tip of a needle does not give a sharp image on a screen. This is due to
  • Polarisation
  • Interference
  • Diffraction
  • None of these
What is diffraction of light?
  • The process where the incident light on a surface is bounced back into the same medium
  • Splitting of a ray of light into its 7 constituent colours is known as diffraction
  • The process by which a beam of light is spread out as a result of passing through a narrow aperture or across an edge,is known as diffraction
  • None of these
Assertion: Coloured spectrum is seen when we look through a muslin cloth.
Reason: It is due to the diffraction of white light on passing through fine slits.
  • If both assertion and reason are true but the reason is the correct explanation of assertion
  • If both assertion and reason are true but the reason is not the correct explanation ofassertion
  • If assertion is true but reason is false
  • If both the assertion and reason are false
  • If reason is true but assertion is false
Wavefront of a wave has direction with wave motion
  • parallel
  • perpendicular
  • opposite
  • at an angle of $$\theta$$
Interference occurs in which of the following waves?
  • Transverse
  • Electromagnetic
  • Longitudinal
  • All of these
When resonance of two light waves occurs, it results in:
  • absorption of light waves
  • transmission of light waves
  • a light color
  • transparency
  • a loud sound
Light waves exhibit polarization but sound waves do not exhibit polarization because they are not:
  • longitudinal
  • coherent
  • dispersive
  • transverse
  • refractive
A series of light waves pass through a 200-nanometer gap in a wall. Identify which light wave diffracts the MOST?
  • wave with 400-nm wavelength
  • wave with 200-nm wavelength
  • wave with 100-nm wavelength
  • wave with 800-nm wavelength
  • wave with 600-nm wavelength
Alternate bright and dark fringes are observed on a screen. What is the most probable cause of the problem?
  • Light passing through a converging lens
  • Light passing through a diverging lens
  • Light passing through two very narrow slits
  • Photos emitted from a metal
  • Photos in an emission spectrum
The wave theory of light, in its original form, was first postulated by.
  • Isaac Newton
  • Christian Huygens
  • Thomas Young
  • Augustin Jean Fresnel
Constructive and destructive interference occur in:
  • cosmic rays
  • light raus
  • sound waves
  • water waves
  • All of these
Identify which of the following best describe diffraction. Diffraction occurs when they:
  • travel around an object or through an opening.
  • transition from one medium to another.
  • bounce off the surface of an object.
  • resonate with the molecules in a medium.
  • pass through a medium unchanged.
Identify which of the following should be used for polarised light waves?
I. Sunglasses
II. Remove ultraviolet light
III. Reveal stress patterns
  • I only
  • II only
  • I and III only
  • II and III only
  • I, II, and III
Diffraction effects are more easily detected in the case of sound waves than light waves because:
  • sound waves are longitudinal
  • sound waves have smaller wavelength
  • sound waves have larger wavelength
  • sound waves are transverse
Water waves strike a solid barrier having a single small opening. Identify what happens to the waves that pass through the opening ?
  • Converge
  • Fan out
  • Invert
  • Interfere
  • Polarize
A beam of light consists of a bundle of light rays.
  • True
  • False
Making a light wave vibrate in only one plane is known as :
  • refraction.
  • reflection
  • Interference
  • diffraction
  • polarization.
Complete the following statement. The diffraction of a wave through a single opening produces
  • refraction
  • an angle of incidence
  • a semicircular wave pattern
  • an increase in speed of the wave
  • a decreases in speed of the wave
Diffraction occurs when light:
  • Travels into a new medium in which it has a new speed
  • Is polarized by reflection
  • Passes through broken or fractured glass
  • Passes through a narrow slit
  • Is absorbed by atoms in a rarefield gas
Why do polarized sun glasses block out some reflected light (glare), but do not block out light that has not been reflected?
  • Some reflected light is at least partially polarized
  • Some reflected light changes frequency
  • Some reflected light is red-shifted
  • Some reflected light is at least partially diffracted
  • Some reflected light splits into multiple photons
What property of waves allows a person to hear sound from a source around the corner of a building?
  • Diffraction
  • Refraction
  • Polarization
  • Interference
  • Amplitude
Which experiment seemed to make it clear that light propogates as a wave?
  • Milikan's oil drop experiment
  • The Michelson-Morley experiment
  • Young's double-slit experiment
  • Fresnel's lens experiment
  • Lenz's proof of Lenz's law
If a light is passed through a single-slit hole and falls onto a screen . Identify the pattern of light produced on the screen :
  • alternating bright and dark lines of equal width
  • a bright central band of light with much smaller, dimmer bands toward the edges
  • concentric circles of light
  • one circle of light
  • one bend of light
Find the right condition(s) for Fraunhoffer diffraction due to a single slit.
  • Source is at infinite distance and the incident beam has converged at the slit.
  • Source is near to the slit and the incident beam is parallel.
  • Source is at infinity and the incident beam is parallel.
  • Source is near to the slit and the incident beam has converged at the slit.
To observe diffraction, the size of the obstacle:
  • has no relation to wavelength.
  • should be $$\lambda / 2$$, where $$\lambda$$ is the wavelength.
  • should be much larger than the wavelength.
  • should be of the order of wavelength.
Diffraction pattern of a single slit consists of a central bright band which is
  • Wide, and is flanked by alternate dark and bright bands of decreasing intensity
  • Narrow, and is flanked by alternate dark and bright bands of equal intensity
  • Wide, and is flanked by alternate dark and bright bands of equal intensity
  • Narrow and is flanked by alternate-dark and bright bands of decreasing intensity
The following cannot be explained by wave nature of light
  • Interference
  • Photo electric effect
  • Diffraction
  • Refraction
Huygen's concept of secondary wave
  • allow up to find the focal length of a thick lens
  • is a geometrical method to find a wavefront
  • is used to determine the velocity of light
  • is used to explain polarization
The phenomenon of rotation of plane polarized light is called
  • Kerr effect
  • Double refraction
  • Optical activity
  • Dichroism
The shape of wave front at a very large distance from source is ______
  • Circular
  • Spherical
  • Cylindrical
  • Plane
For a diffraction from a single slit, the intensity of the central point is:
  • infinite
  • finite and same magnitude as the surrounding maxima
  • finite but much larger than the surrounding maxima
  • finite and substantially smaller than the surrounding maxima
  • zero
The path difference, time difference and phase difference between two successive zones will be :
  • $$\dfrac {\lambda}{2}, \dfrac {T}{2}$$ and $$\pi$$
  • $$\lambda, T$$ and $$\pi$$
  • $$\dfrac {\lambda}{2}, \dfrac {T}{2}$$ and $$\dfrac {\pi}{2}$$
  • $$\dfrac {\lambda}{2}, \dfrac {T}{2}$$ and $$2\pi$$
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