Physics M.C.Q (1 Marks)

Polarised glass is used in sun glasses because

A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that

Out of the following statements which is not correct

Plane polarised light is passed through a polaroid. On viewing through the polaroid we find that when the polariod is given one complete rotation about the direction of the light, one of the following is observed

Which of following can not be polarised

The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refraction index n) is (

Refractive index of material is equal to tangent of polarising angle. It is called

Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam

Two Nicols are oriented with their principal planes making an angle of 60°. The percentage of incident unpolarized light which passes through the system is
 

Consider the following statements A to B and identify the correct answer
A. Polarised light can be used to study the helical surface of nucleic acids.
B. Optics axis is a direction and not any particular line in the crystal

When a plane polarised light is passed through an analyser and analyser is rotated through 90°, the intensity of the emerging light

Polarising angle for water is 53°4'. If light is incident at this angle on the surface of water and reflected, the angle of refraction is

When light is incident on a doubly refracting crystal, two refracted rays-ordinary ray (O-ray) and extra ordinary ray (E-ray) are produced. Then

A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude

A calcite crystal is placed over a dot on a piece of paper and rotated, on seeing through the calcite one will be see

The transverse nature of light is shown by

In order to see diffraction the thickness of the film is

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

Through which character we can distinguish the light waves from sound waves

Light waves can be polarised as they are

A polariser is used to

A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is

Light of wavelength l = 5000 Å falls normally on a narrow slit. A screen placed at a distance of 1 m from the slit and perpendicular to the direction of light. The first minima of the diffraction pattern is situated at 5 mm from the centre of central maximum. The width of the slit is

To observe diffraction the size of an obstacle

The condition for observing Fraunhofer diffraction from a single slit is that the light wavefront incident on the slit should be

Diffraction and interference of light suggest

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is

Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (a is the width of the slit)

Diffraction effects are easier to notice in the case of sound waves than in the case of light waves because

What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

A diffraction is obtained by using a beam of red light. What will happen if the red light is replaced by the blue light

The penetration of light into the region of geometrical shadow is called

The bending of beam of light around corners of obstacles is called

When light is incident on a diffraction grating the zero order principal maximum will be
 

The diffraction effect can be observed in

When a compact disc is illuminated by a source of white light. Coloured 'lanes' are observed. This is due to

In a diffraction pattern by a wire, on increasing diameter of wire, fringe width

The phenomenon of diffraction of light was discovered by

Light of wavelength 589.3 nm is incident normally on the slit of width 0.1 mm. What will be the angular width of the central diffraction maximum at a distance of 1 m from the slit

Conditions of diffraction is