JEE Questions for Physics Ray Optics Quiz 16 - MCQExams.com

An object is at a distance of 0.5 m in front of a planemirror. Distance between the object and image is
  • 0.5 m
  • 1 m
  • 0.25 m
  • 1.5 m
A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be
  • √2
  • √3
  • 1.5
  • 2.0
When seen in green light, the saffron and green portions of our National Flag will appear to be
  • Black
  • Black and green respectively
  • Green
  • Green and yellow respectively
At sun rise or sunset, the sun looks more red than at mid-day because
  • The Sun is hottest at these times
  • Of the scattering of light
  • Of the effects of refraction
  • Of the effects of diffraction
Line spectrum contains information about
  • The atoms of the prism
  • The atoms of the source
  • The molecules of the source
  • The atoms as well as molecules of the source
Missing lines in a continuous spectrum reveal
  • Defects of the observing instrument
  • Absence of some elements in the light source
  • Presence in the light source of hot vapors of some elements
  • Presence of cool vapors of some elements around the light source
A source emits light of wavelength 4700 Å, 5400 Åand 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum
  • 6500 Å
  • 5400 Å
  • 4700 Å
  • All the above
When light of wavelength λ, is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then

  • Physics-Ray Optics-86204.png
  • 2)
    Physics-Ray Optics-86205.png
  • 2

  • Physics-Ray Optics-86206.png
Which of the following diagrams shows correctly the dispersion of white light by a prism

  • Physics-Ray Optics-86208.png
  • 2)
    Physics-Ray Optics-86209.png

  • Physics-Ray Optics-86210.png

  • Physics-Ray Optics-86211.png
A neon sign does not produce
  • Line spectrum
  • An emission spectrum
  • An absorption spectrum
  • Photons
The sky would appear red instead of blue if
  • Atmospheric particles scatter blue light more than red light
  • Atmospheric particles scatter all colours equally
  • Atmospheric particles scatter red light more than the blue light
  • The sun was much hotter
A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected, if θ = 45°. The index of refraction of glass is
Physics-Ray Optics-86212.png
  • Less than 1.41
  • Equal to 1.41
  • Greater than 1.41
  • None of these
The wavelength of emission line spectrum and absorption line spectrum of a substance are related as
  • Absorption has larger value
  • Absorption has smaller value
  • They are equal
  • No relation
White light is passed through a prism whose angle is 5°. If the refractive indices for rays of red and blue colour are respectively 1.64 and 1.66, the angle of deviation between the two colours will be
  • 0.1 degree
  • 0.2 degree
  • 0.3 degree
  • 0.4 degree
From which source a continuous emission spectrum and a line absorption spectrum are simultaneously obtained
  • Bunsen burner flame
  • The Sun
  • Tube light
  • Hot filament of an electric bulb
The spectrum obtained from a sodium vapor lamp isan example of
  • Absorption spectrum
  • Emission spectrum
  • Continuous spectrum
  • Band spectrum
The splitting of white light into several colours on passing through a glass prism is due to
  • Interference
  • Diffraction
  • Refraction
  • Reflection
A white screen illuminated by green and red light appears to be
  • Green
  • Red
  • Yellow
  • White
Dark lines on solar spectrum are due to
  • Lack of certain elements
  • Black body radiation
  • Absorption of certain wavelengths by outer layers
  • Scattering
Line spectra are due to
  • Hot solids
  • Atoms in gaseous state
  • Molecules in gaseous state
  • Molecules in gaseous state
The path of a refracted ray of light in a prism is parallel to the base of the prism only when the
  • Light is of a particular wavelength
  • Ray is incident normally at one face
  • Ray undergoes minimum deviation
  • Prism is made of a particular type of glass
A ray incident at 15° on one refracting surface of a prism of angle 60° , suffers a deviation of 55° . What isthe angle of emergence
  • 95°
  • 45°
  • 30°
  • None of these
Two lenses having f1 : f2 = 2 : 3 has combination to make no dispersion. Find the ratio of dispersive power of glasses used
  • 2 : 3
  • 3 : 2
  • 4 : 9
  • 9 : 4
In absorption spectrum of Na the missing wavelength(s) are
  • 589 nm
  • 589.6 nm
  • Both
  • None of these
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is the angle of incidence i is nearly equal to
  • A/ μ
  • A/2μ
  • μA
  • μA/2
Colour of the sky is blue due to
  • Scattering of light
  • Total internal reflection
  • Total emission
  • None of these above
Which of the following spectrum have all the frequencies from high to low frequency range
  • Band spectrum
  • Continuous spectrum
  • Line spectrum
  • Discontinuous spectrum
Stars are not visible in the day time because
  • Stars hide behind the sun
  • Stars do not reflect sun rays during day
  • Stars vanish during the day
  • Atmosphere scatters sunlight into a blanket of extreme brightness through which faint stars cannot be visible

Physics-Ray Optics-86221.png
  • 1/2
  • 1/4
  • 2
  • 1/5
A ray of light is incident on an equilateral glass prism placed on a horizontal table. For minimum deviation which of the following is true
Physics-Ray Optics-86223.png
  • PQ is horizontal
  • QR is horizontal
  • RS is horizontal
  • Either PQ or RS is horizontal
The deviation caused in red, yellow and violet colours for crown glass prism are 2.84°, 3.28° and 3.72° respectively. The dispersive power of prism material is
  • 0.268
  • 0.368
  • 0.468
  • 0.568
Dispersion of light is due to
  • Wavelength
  • Intensity of light
  • Density of medium
  • None of these
Pick the correct statement from the following.
  • Primary rainbow is a virtual image and secondary rainbow is a real image
  • Primary rainbow is a real image and secondary rainbow is a virtual image.
  • Both primary and secondary rainbows are virtual images.
  • Both primary and secondary rainbows are real images.
When white light enters a prism, it gets split into itsconstituent colours. This is due to
  • High density of prism material
  • Because i.t is different for different A.
  • Diffraction of light
  • Velocity changes for different frequencies
The dispersive powers of crown and flint glasses are 0.02 and 0.04 respectively. In an achromatic combination of lenses the focal length of flint glass lens is 40 cm. The focal length of crown glass lens will be
  • – 20 cm
  • + 20 cm
  • – 10 cm
  • + 10 cm
Consider the following two statements A and B and identify the correct choice in the given answers
A : Line spectra is due to atoms in gaseous state
B : Band spectra is due to molecules
  • Both A and B are false
  • A is true and B is false
  • A is false and B is true
  • Both A and B are true
Under minimum deviation condition in a prism, if a ray is incident at an angle 30°, the angle between the emergent ray and the second refracting surface of theprism is
  • 0°
  • 30°
  • 45°
  • 60°
A ray of light is incident normally on one of the face of a prism of angle 30° and refractive index√2. The angle ofdeviation will be
  • 26°
  • 0°
  • 23°
  • 15°
The spectrum obtained from an electric lamp or redhot heater is
  • Line spectrum
  • Band spectrum
  • Absorption spectrum
  • Continuous spectrum
Which one of the following alternative is FALSE for a prism placed in a position of minimum deviation
  • i1. = i2
  • r1 = r2
  • i1. = r1
  • All of these
In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are ω, ω\' and d, d\' respectively. The condition for getting deviation without dispersion when the twoprisms are combined is

  • Physics-Ray Optics-86229.png
  • 2)
    Physics-Ray Optics-86230.png

  • Physics-Ray Optics-86231.png

  • Physics-Ray Optics-86232.png
The solar spectrum during a complete solar eclipse is
  • Continuous
  • Emission line
  • Dark line
  • Dark band
A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure. The ray will suffer
Physics-Ray Optics-86234.png
  • Greater deviation
  • Same deviation
  • No deviation
  • Total internal reflection
In the given figure, what is the angle of prism?
Physics-Ray Optics-86235.png
  • A
  • B
  • C
  • D
A convex lens, a glass slab, a glass prism and a solid sphere all are made of the same glass, the dispersive power will be
  • In the glass slab and prism
  • In the lens and solid sphere
  • Only in prism
  • In all the four
A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m, 0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be
  • 619/1000
  • 9/200
  • 14/205
  • 5/214
The spectrum of an oil flame is an example for
  • Line emission spectrum
  • Continuous emission spectrum
  • Line absorption spectrum
  • Band emission spectrum
In an equilateral prism if incident angle is 45° thenminimum deviation is
  • 30°
  • 60°
  • 45°
  • 90°
For the myopic eye, the defect is cured by
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • Toric lens
Lens used to remove long sightedness (hypermetropia)is
or
A person suffering from hypermetropia requires which type of spectacle lenses
  • Concave lens
  • Plano-concave lens
  • Convexo-concave lens
  • Convex lens
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