Wave Optics - SS1 Physics Past Questions and Answers - page 4
Which of the following statements is true about the single-slit diffraction pattern?
The bright fringes become wider as the slit width increases
The dark fringes become narrower as the wavelength of light increases.
The spacing between the fringes becomes narrower as the slit width decreases.
The intensity of the fringes remains constant regardless of the slit width.
What happens to the single-slit diffraction pattern when the wavelength of light is decreased?
The bright fringes become wider.
The dark fringes become wider.
The bright fringes become narrower.
The dark fringes become narrower.
Explain the phenomenon of single-slit diffraction.
Single-slit diffraction is the bending or spreading out of light waves as they pass through a narrow slit. When a beam of light passes through a single slit, it spreads out and forms a diffraction pattern on a screen. This occurs because the slit acts as a secondary source of waves, and the diffracted waves interfere with each other, creating regions of constructive and destructive interference.
Describe the factors that affect the extent of single-slit diffraction.
The extent of single-slit diffraction is affected by several factors. The most significant factor is the width of the slit. As the width of the slit decreases, the diffraction pattern becomes wider and the fringes become narrower. The wavelength of light also plays a role, with shorter wavelengths resulting in narrower fringes. The distance between the slit and the screen can also influence the diffraction pattern, with larger distances leading to wider fringes.
What is polarisation of light?
The bending of light waves as they pass through a medium.
The separation of white light into its component colours.
The alignment of light waves along a specific orientation.
The reflection of light waves off a smooth surface.
What type of light waves can be polarised?
Longitudinal waves
Transverse waves
Electromagnetic waves
Mechanical waves.
Which type of polarisation occurs when light waves vibrate in a single plane?
Unpolarised light
Linear polarisation
Circular polarisation
Transverse polarisation.
What optical device can be used to produce polarised light?
Convex lens
Concave lens
Prism.
Polarising filter.
How does a polarising filter work?
It absorbs all light waves except those vibrating in a specific direction
It refracts light waves to separate them based on their wavelength
It reflects light waves off a metallic surface
It scatters light waves in multiple directions.
Which statement about polarisation is true?
All light waves are naturally polarised
Polarisation can only occur in a vacuum
The direction of polarisation is always vertical
The angle of polarisation depends on the medium through which the light passes.