JEE Questions for Physics Ray Optics Quiz 9 - MCQExams.com

A normal person wants to see two pillars at a distant 11 km away separately. The distance between two pillars should be approximately_________.
  • 1 m
  • 3.2 m
  • 0.5 m
  • 1.6 m
When the length of microscope tube increases, its magnifying power________.
  • decreases
  • increaes
  • does not change
  • none of these
The focal lengths of objective and the eye–piece of a compound microscope are fo and fe respectively.Then___________.
  • Fo > Fe
  • Fo < Fe
  • Fo = Fe
  • None of these
The magnifying power of a telescope is 9.0 when it is focused for parallel rays, then the distance between its objective and eye–piece is 20 cm The focal lengths of lenses will be___________.
  • 15 cm, 5 cm
  • 18 cm, 2 cm
  • 10 cm, 5 cm
  • 11 cm, 9 cm
A plano convex lens of f = 20 cm is silvered at plane surface new f will be___________cm
  • 20
  • 40
  • 30
  • 60
A ray of light from denser medium strikes a rarer medium at angle of incidence i. The reflected and refracted rays make an angle of 90o with each other The angle of reflection and refraction are r and r \' respectively. The critical angle is ________________.
  • sin–1 (tan p)
  • tan–1 (tan r)
  • tan–1 (sin i)
  • sin–1 (tan r)
Relation between critical angle of water Cw and that of the glass Cg is _________. (given nw = 4/3, ng = 1.5)
  • Cw < Cg
  • Cw = Cg
  • Cw > Cg
  • Cw = Cg = 0
The radius of curvature of convex surface of a thin plano–convex lens is 15 cm and refractive index of its material is 1.6 The power of the lens will be___________.
  • 6D
  • 5D
  • 4D
  • 3D
A ray of light passes through a prism having refractive index (n = √2), Suffers minimum deviation If angle of incident is double the angle of refraction within prism then angle of prism is____________.
  • 30o
  • 60o
  • 90o
  • 180o
An air bubble inside glass slab (n =1.appear from one side at 6 cm and from other side at 4 cm. Then the thickness of glass slab is____________cm
  • 5
  • 10
  • 15
  • 20
The magnifying power of objective of a compound microscope is 5.0 If the magnifying power of microscope is 30, then magnifying power of eye–piece will be_________.
  • 3
  • 6
  • 9
  • 12
Light of certain colour contain 2000 waves in the length of 1 mm in air. What will be the wavelength of this light in medium of refractive index 1.25 ?
  • 1000 Å
  • 2000 Å
  • 3000 Å
  • 4000 Å
For a concave lens, if real image is formed the graph between (u + v) and u or v is as follows

  • Physics-Ray Optics-86567.png
  • 2)
    Physics-Ray Optics-86568.png

  • Physics-Ray Optics-86569.png

  • Physics-Ray Optics-86570.png
In each of the following questions match column-I and column-II and select the correct match out of the four given choices.
Physics-Ray Optics-85743.png
  • i – a, ii – b, iii – c, iv – d
  • i – d, ii – c, iii – b, iv – a
  • i – b, ii – c, iii – d, iv – a
  • i – c, ii – b, iii – d, iv – a

Physics-Ray Optics-85744.png
  • i – c, ii – d, iii – b, iv – a
  • i – a, ii – b, iii – c, iv – d
  • i – d, ii – c, iii – b, iv – a
  • i – b, ii – c, iii – a, iv – d

Physics-Ray Optics-85745.png
  • i – c, ii – d, iii – b, iv – a
  • i – a, ii – b, iii – c, iv – d
  • i – c, ii – b, iii – a, iv – d
  • i – d, ii – c, iii – b, iv – d
A convex lens of glass (n =1.has focal length 0.2 m The lens is immersed in water of refractive index 1.33. The change in the power of convex lens is ____________.
  • 3.72 D
  • 4.62 D
  • 6.44D
  • 1.86D
For a prism of refractive index √3 , the angle of minimum deviation is deviation is equal to the angle of prism, then angle of the prism is__________.
  • 60o
  • 90o
  • 45o
  • 180o
A ray of light is incident normally on one of the faces of a solid prism of angle 30o and refractive index √2. The angle of minimum deviation is__________.
  • 39o
  • 42o
  • 52o
  • 15o
A Plano–convex lens has been fixed exactly into a plano–concave lens as shown in figure. Their plane surface are parallel to each other. If both the lenses are made of different materials of refractive indices n1 and n2 , R is the radius of curvature of the curved surface of the lens, their focal length of the combination will be_________.

  • Physics-Ray Optics-85749.png
  • 2)
    Physics-Ray Optics-85750.png

  • Physics-Ray Optics-85751.png

  • Physics-Ray Optics-85752.png
A concave mirror has a focal length 30 cm The distance between the two position of the object for which image size is double of the object is_____________.
  • 30 cm
  • 15 cm
  • – 25 cm
  • – 15 cm
A concave lens forms the image of an object such that the distance between the object and the image is 10 cm and the magnification produced is 1/4, the focal length of lens will be__________cm
  • –6.2
  • –12.4
  • –4.4
  • –8.8
A prism of certain angle deviates the red and blue rays by 8o and 12o respectively. Another prism of the same prism angle deviates the red list at small angle and made of different materials The dispersive powers of the materials of the prisms are in the ratio_________.
  • 5 : 6
  • 9 : 11
  • 6 : 5
  • 11 : 9
The head light of a jeep are 1.2 m apart. If the pupil of the eye of an observer has a diameter of 2 mm and light of wavelength 5836 Å is used what should be the maximum distance of the jeep from the observer if two head lights are just seem to be separated apart ?
  • 30.9 km
  • 33.4 km
  • 3.34 km
  • 31.9 km
The effective focal length of the lens combination shown in the curved surface of the plano convex lenses are 12 cm each and refractive index of the material of the lens is 1.5. the refractive index of liquid is________.
  • 1.33
  • 1.42
  • 1.53
  • 1.60
Interference is possible in____________.
  • light waves only
  • Sound waves only
  • both light and Sound waves
  • None of these
Huygens\'s wave theory of light can not explain __________phenomena.
  • Diffraction
  • Interference
  • palarization
  • Photoelectric effect
The correct curve between fringe width β and distance between the slits d is shown below figure is________.

  • Physics-Ray Optics-85759.png
  • 2)
    Physics-Ray Optics-85760.png

  • Physics-Ray Optics-85761.png

  • Physics-Ray Optics-85762.png

Physics-Ray Optics-85763.png
  • 2 : 1
  • 1 : 2
  • 1 : 1
  • √2 : 1
Wave light travels from an optically rarer medium to an optically denser medium its velocity decrease because of change in____________.
  • frequency
  • wavelength
  • amplitude
  • phase
The young\'s double slit experiment is performed with blue and with green light of wavelengths 4360 Å and 5460 Å respectively. If x is the distance of 4th maxima from the central one, then________.
  • Xblue = Xgreen
  • Xblue > Xgreen
  • Xblue < Xgreen
  • None of these
The light waves from two coherent sources of same intensity interfere each other. Then what will be maximum intensity when minimum intensity is zero ?
  • 4 I
  • I
  • 4 I2
  • I2

Physics-Ray Optics-85764.png

  • Physics-Ray Optics-85765.png
  • 2)
    Physics-Ray Optics-85766.png

  • Physics-Ray Optics-85767.png

  • Physics-Ray Optics-85768.png
In young\'s double slit experiment, phase difference between light waves reaching 3rd bright fringe from central fringe with, is___________.( λ = 5000 Å )
  • zero
  • 2π
  • 4π
  • 6π
Which of the following will undergo maximum diffraction ?
  • α - particle
  • γ - rays
  • radio waves
  • light waves
A Slit of width 12 × 10–7 m is illuminated by light of wavelength 6000 Å . The angular width of the central maximum is approximately__________.
  • 30o
  • 60o
  • 90o
  • 0o
The distance between the first and sixth minima in the diffraction pattern of a single slit, it is 0.5 mm. The screen is 0.5 m away from the Slit. If the wavelength of light is 5000 Å , then the width of the slit will be_______________mm
  • 5
  • 2.5
  • 1.25
  • 1.0
____________change in the polarisation pronominal of light ?
  • intensity
  • wavelength
  • phase
  • frequency
In young\'s double slit experiment the phase difference is constant between two sources is π/2. The intensity at a point equidistant from the slits in terms of max. intensity I0 is_____________.
  • 3 I0
  • I0/2
  • I0
  • 3I0/4
In figure young\'s double slit experiment Q is the position of the first bright fringes on the right side of O, p is the 11th fringe on the other side as measured from Q If λ = 6000 Å then S1 B will be___________m
  • 6.6 × 10–6
  • 3.3× 10–6
  • 6 × 10–6
  • 6 × 10+6
The two coherent sources of intensity β produce interference. The fringe visibility will be________
  • 2 β
  • 2)
    Physics-Ray Optics-85769.png

  • Physics-Ray Optics-85770.png

  • Physics-Ray Optics-85771.png
Light of wave–length λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen placed at a distance D. The linear width of the principal maximum is equal to the width of the slit, then D = __________________.

  • Physics-Ray Optics-85772.png
  • 2)
    Physics-Ray Optics-85773.png

  • Physics-Ray Optics-85774.png

  • Physics-Ray Optics-85775.png
A polarise is used for____________.
  • produce polarised light
  • produced unpolarised light
  • produced unpolarised wave
  • None of these

Physics-Ray Optics-85776.png
  • zero
  • 2)
    Physics-Ray Optics-85777.png

  • Physics-Ray Optics-85778.png
  • None of these
The width of a single slit, if the first minimum is observed at an angle of 2o with a wavelength of light 6980 Å is __________mm
  • 0.2
  • 2 × 10–5
  • 2 × 105
  • 0.02
In a fraunhofer diffraction by single slit of width d with incident light of wavelength 5500 Å the first minimum is observed at angle of 30 . The first secondary maximum is observed at an angle θ = _________.

  • Physics-Ray Optics-85779.png
  • 2)
    Physics-Ray Optics-85780.png

  • Physics-Ray Optics-85781.png

  • Physics-Ray Optics-85782.png
The phenomenon of polarisation of electromagnetic waves proves that the electromagnetic waves are_______.
  • mechanical
  • longitudinal
  • transverse
  • None of these
Light from two coherent Sources of the same amplitude A and wavelength λ , illuminates the Screen. The intensity of the central maximum is Io. If the sources were incoherent, the intensity at the same point will be__________.
  • Io/2
  • Io/4
  • 4Io
  • 2Io
Image formed by a convex mirror is
  • Virtual
  • Real
  • Enlarged
  • Inverted
When the angle of incidence is 60o on the Surface of a glass slab, it is found that the reflected ray is completely polarised. Then the velocity of light in glass is______________ms–1

  • Physics-Ray Optics-85783.png
  • 2)
    Physics-Ray Optics-85784.png

  • Physics-Ray Optics-85785.png

  • Physics-Ray Optics-85786.png
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