JEE Questions for Physics Ray Optics Quiz 13 - MCQExams.com

Which one of the following is not associated with totalinternal reflection
  • The mirage formation
  • Optical fiber communication
  • The glittering of diamond
  • Dispersion of light
Refractive index of a medium is μ. The incidence angle is twice that of refracting angle. The angle of incidenceis

  • Physics-Ray Optics-86024.png
  • 2)
    Physics-Ray Optics-86025.png

  • Physics-Ray Optics-86026.png

  • Physics-Ray Optics-86027.png
A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x. If the numerical value of the magnification produced by the lens is m, then the focal length of the lens is

  • Physics-Ray Optics-86029.png
  • 2)
    Physics-Ray Optics-86030.png

  • Physics-Ray Optics-86031.png

  • Physics-Ray Optics-86032.png
Two lenses are placed in contact with each other and the focal length of combination is 80 cm. If the focal length of one is 20 cm, then the power of the other will be
  • 1.66 D
  • 4.00 D
  • –1.00 D
  • –3.75 D

Physics-Ray Optics-86035.png
  • 2 : 2 : 1
  • 1 : 1 : 1
  • 1 : 2 : 2
  • 2 : 1 : 1
The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit S and the collimating lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure
Physics-Ray Optics-86037.png
  • 1
  • 3
  • 2
  • None of the figures
A thin convex lens of focal length 10 cm is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be
  • Zero
  • Infinity
  • 10 cm
  • 20 cm
In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45° with the x-axis meets the experimental curve at P.The coordinates of P will be

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  • 2)
    Physics-Ray Optics-86040.png

  • Physics-Ray Optics-86041.png

  • Physics-Ray Optics-86042.png
A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length ofthe object must be
  • 1/4 cm
  • 8 cm
  • 12 cm
  • 20 cm
The ray diagram could be correct
Physics-Ray Optics-86045.png
  • If n1 = n2 = ng
  • If n1 = n2 and n1.g
  • If n1 = n2 and n1>ng
  • Under no circumstances
The distance between an object and a divergent lens ism times the focal length of the lens. The linearmagnification produced by the lens is
  • m
  • 1/m
  • m + 1

  • Physics-Ray Optics-86047.png
A glass lens is placed in a medium in which it is found to behave like a glass plate. Refractive index of the medium will be
  • Greater than the refractive index of glass
  • Smaller than the refractive index of glass
  • Equal to refractive index of glass
  • No case will be possible from above
A convex lens of crown glass (n = 1.will behave asa divergent lens if immersed in
  • Water (n = 1.33)
  • In a medium of n = 1.525
  • Carbon disulphide n = 1.66
  • It cannot act as a divergent lens
A divergent lens will produce
  • Always a virtual image
  • Always real image
  • Sometimes real and sometimes virtual
  • None of the above
The minimum distance between an object and its real image formed by a convex lens is
  • 1.5 f
  • 2 f
  • 2.5 f
  • 4 f
An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on theother side of the lens at a distance
  • 20 cm
  • 10 cm
  • 40 cm
  • 30 cm
Two thin lenses, one of focal length + 60 cm and the other of focal length – 20 cm are put in contact. Thecombined focal length is
  • + 15 cm
  • –15 cm
  • + 30 cm
  • –30 cm
A double convex lens of focal length 20 cm is made of glass of refractive index 3/2. When placed completely in water (aμw = 4/3), its focal length will be
  • 80 cm
  • 15 cm
  • 17.7 cm
  • 22.5 cm
The focal lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersivepower of material of lens is
  • 0.325
  • 0.0325
  • 0.98
  • 0.968
A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side of the principal axis, theintensity of light
  • First decreases and then increases
  • Continuously increases
  • Continuously decreases
  • First increases and then decreases
A double convex thin lens made of glass (refractive index μ = 1.has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will converge at a distance L such that
  • L = 20 cm
  • L =10 cm
  • L = 40 cm
  • L = 20/3 cm
A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of thematerial is
  • Equal to unity
  • Equal to 1.33
  • Between unity and 1.33
  • Greater than 1.33
A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then, the image would
  • Disappear
  • Remain as real image still
  • Be virtual and of the same size as the object
  • Suffer from aberrations
Focal length of a convex lens will be maximum for
  • Blue light
  • Yellow light
  • Green light
  • Red light
A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall for its two different positions. The area of the source or light is

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  • 2)
    Physics-Ray Optics-86060.png

  • Physics-Ray Optics-86061.png

  • Physics-Ray Optics-86062.png
A combination of two thin lenses with focal lengths f1 and f2 respectively forms an image of distant object at distance 60 cm when lenses are in contact. The position of this image shifts by 30 cm towards the combination when two lenses are separated by 10 cm. The corresponding values of f1 and f2are
  • 30 cm, –60 cm
  • 20 cm, –30 cm
  • 15 cm, –20 cm
  • 12 cm, –15 cm
If the central portion of a convex lens is wrapped inblack paper as shown in the figure
Physics-Ray Optics-86065.png
  • No image will be formed by the remaining portion of the lens
  • The full image will be formed but it will be less bright
  • The central portion of the image will be missing
  • There will be two images each produced by one of the exposed portions of the lens
A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by appropriately placing
  • A convex mirror of suitable focal length
  • A concave mirror of suitable focal length
  • A concave lens of suitable focal length
  • A convex lens of suitable focal length less than 0.25 m
A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black, the image will
  • Be shifted downwards
  • Be shifted upwards
  • Not be shifted
  • Shift on the principal axis
In the figure, an air lens of radii of curvature 10 cm (R1 = R2 = 10 cm) is cut in a cylinder of glass (μ = 1.5). The focal length and the nature of the lens is
Physics-Ray Optics-86066.png
  • 15 cm, concave
  • 15 cm, convex
  • ∞ , neither concave nor convex
  • 0, concave
A lens (focal length 50 cm) forms the image of a distant object which subtends an angle of 1 milliradian at the lens. What is the size of the image
  • 5 mm
  • 1 mm
  • 0.5 mm
  • 0.1 mm
The focal length of a simple convex lens used as a magnifier is 10 cm. For the image to be formed at a distance of distinct vision (D = 25 cm), the object must be placed away from the lens at a distance of
  • 0.5 cm
  • 7.14 cm
  • 7.20 cm
  • 16.16 cm
A plano convex lens is made of glass of refractive index 1.5. The radius of curvature of its convex surface is R.Its focal length is

  • Physics-Ray Optics-86070.png
  • R
  • 2R
  • 1.5 R
Two lenses have focal lengths f1 and f2 and their dispersive powers are ω1 and ω2 respectively. They will together form an achromatic combination if
  • ω1f1 = ω1f2
  • ω1f2 + ω2f1 = 0
  • ω1 + f1 = ω2+ f2
  • ω1 – f1 = ω2 – f2
The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm, then the nature and focal length of the other lens would be
  • Convex, 9 cm
  • Concave, 9 cm
  • Convex, 25 cm
  • Concave, 25 cm
A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly
  • 20 cm
  • 31 cm
  • 35 cm
  • 50 cm
The plane surface of a plano-convex lens of focal length f is silvered. It will behave as
  • Plane mirror
  • Convex mirror of focal length 2f
  • Concave mirror of focal length f/2
  • None of the above
A lens of refractive index n is put in a liquid of refractive index n\' if focal length of lens in air is f, its focal length in liquid will be

  • Physics-Ray Optics-86076.png
  • 2)
    Physics-Ray Optics-86077.png

  • Physics-Ray Optics-86078.png

  • Physics-Ray Optics-86079.png
An object of height 1.5 cm is placed on the axis of a convex lens of focal length 25 cm. A real image is formed at a distance of 75 cm from the lens. The size of the image will be
  • 4.5 cm
  • –3.0 cm
  • 0.75 cm
  • 0.5 cm
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a cut lens will be
  • 2D
  • 3D
  • 4D
  • 5D
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
  • 50 cm
  • 100 cm
  • 200 cm
  • 400 cm
A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a
  • Convergent lens of focal length 3.5 R
  • Convergent lens of focal length 3.0 R
  • Divergent lens of focal length 3.5 R
  • Divergent lens of focal length 3.0 R
An object is placed at 15 cm from a convex lens of focal length 10 cm. Where should another convex mirror of radius 12 cm placed such that image will coincide withobject
  • 18 cm
  • 17 cm
  • 14 cm
  • 20 cm
A convex and a concave lens separated by distance d are then put in contact. The focal length of thecombination
  • Becomes 0
  • Remains the same
  • Decreases
  • Increases
A thin lens made of glass of refractive index 1.5 has a front surface + 11 D power and back surface – 6 D. If this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is
  • – 0.5 D
  • + 0.5D
  • – 0.625 D
  • + 0.625 D
An object is placed first at infinity and then at 20 cm from the object side focal plane of the convex lens. The two images thus formed are 5 cm apart. The focal length of the lens is
  • 5 cm
  • 10 cm
  • 15 cm
  • 20 cm
The distance between an object and the screen is 100 cm. A lens produces an image on the screen when placed at either of the positions 40 cm apart. The power of the lens is
  • ≈ 3 diopters
  • ≈ 5 diopters
  • ≈ 7 diopters
  • ≈ 9 diopters
A convex lens is made of 3 layers of glass of 3 different materials as in the figure. A point object is placed on its axis. The number of images of the object are
Physics-Ray Optics-86089.png
  • 3
  • 4
  • 1
  • 2
A achromatic combination is made with a lens of focal length f and dispersive power co with a lens having dispersive power of 2co. The focal length of second will be
  • 2 f
  • f / 2
  • –f/2
  • –2f
A biconvex lens with equal radii curvature has refractive index 1.6 and focal length 10 cm. Its radiusof curvature will be
  • 20 cm
  • 16 cm
  • 10 cm
  • 12 cm
0:0:1


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