JEE Questions for Physics Ray Optics Quiz 10 - MCQExams.com

Two beams of Light of intensity I1 and I2 interfere to give an interference pattern. If the ratio of maximum intensity to that of minimum intensity is 16/4 then I1/I2 = ____________________
  • 1 : 9
  • 1 : 4
  • 4 : 1
  • 9 : 1
Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the resultant intensities at A and B is____________.
  • I
  • 4I
  • 2I
  • 6I
Which of the following phenomenon is used in optical fibres ?
  • Reflection
  • Scatterting
  • Total internal reflection
  • interference
A sound source emits sound of 600 Hz frequency, this sound enters by opened door of width 0.75 m. Find the angle on one side at which first minimum is formed. The speed of sound = 300ms–1 .
  • 84.4o
  • 90o
  • 74.2o
  • 47.2o

Physics-Ray Optics-85790.png
  • 19%
  • 92%
  • 50%
  • 29%
In Yong\'s double slit experiment, the intensity on screen at a point where path difference is λ , is K , What will be intensity at the point where path difference is λ/4
  • K/2
  • 2 K
  • 4 K
  • Zero

Physics-Ray Optics-85792.png

  • Physics-Ray Optics-85793.png
  • 2)
    Physics-Ray Optics-85794.png

  • Physics-Ray Optics-85795.png

  • Physics-Ray Optics-85796.png
Two vertical plane mirrors are inclined at an angle of 60° with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other. The resultant deviation is
  • 60°
  • 120°
  • 180°
  • 240°
A plane mirror reflects a pencil of light to form a real image. Then the pencil of light incident on the mirror is
  • Parallel
  • Convergent
  • Divergent
  • None of these
What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other
  • 60°
  • 90°
  • 120°
  • 175°
A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then
  • The reflected ray does not rotate
  • The reflected ray rotates through an angle θ
  • The reflected ray rotates through an angle 2θ
  • The incident ray is fixed
A plane mirror is approaching you at a speed of 10cm/s. You can see your image in it. At what speed will your image approach you
  • 10cm/s
  • 5cm/s
  • 20cm/s
  • 15cm/s
A ray of light incidents on a plane mirror at an angle of 30°. The deviation produced in the ray is
  • 30°
  • 60°
  • 90°
  • 120°
A ray of light is incidenting normally on a plane mirror. The angle of reflection will be
  • 0°
  • 90°
  • Will not be reflected
  • None of these
When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
  • 0
  • π/2
  • π
  • 2π
A ray is reflected in turn by three plane mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is
  • 90°
  • 60°
  • 180°
  • None of these
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand
  • None
  • 1
  • 2
  • 3
When a plane mirror is rotated through an angle θ then the reflected ray turns through the angle 2θ then the size of the image
  • Is doubled
  • Is halved
  • Remains the same
  • Becomes infinite
A plane mirror makes an angle of 30° with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray
  • 30°
  • 45°
  • 60°
  • 90°
A ray of light is incident at 50° on the middle of one of the two mirrors arranged at an angle of 60° between them. The ray then touches the second mirror, gets reflected back to the first mirror, making an angle of incidence of
  • 50°
  • 60°
  • 70°
  • 80°
A small object is placed 10 cm infront of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance focused for your eye will be
  • 60 cm
  • 20 cm
  • 40 cm
  • 80 cm
A man runs towards a mirror at a speed 15 m/s. The speed of the image relative to the man is
  • 15 ms–1
  • 30 ms–1
  • 35 ms–1
  • 20 ms–1
To get three images of a single object, one should have two plane mirrors at an angle of
  • 30°
  • 60°
  • 90°
  • 150°
A man of length h requires a mirror, to see his own complete image of length at least equal to
  • h/4
  • h/3
  • h/2
  • h
A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle θ, the reflected light will deviate from its original path by the angle
  • 2θ
  • 0°
  • θ
  • 4θ
A man having height 6 m. He observes image of 2 m height erect, then mirror used is
  • Concave
  • Convex
  • Plane
  • None of these
Two mirrors at an angle θ produce 5 images of a point. The number of images produced when θ is decreased to 30° is
  • 9
  • 10
  • 11
  • 12
A convex mirror of focal length f forms an image which is 1/n times the object. The distance of the object from the mirror is

  • Physics-Ray Optics-85812.png
  • 2)
    Physics-Ray Optics-85813.png

  • Physics-Ray Optics-85814.png

  • Physics-Ray Optics-85815.png
A 2.0 cm tall object is placed 15 cm in front of a concave mirror of focal length 10 cm. What is the size and nature of the image
  • 4 cm, real
  • 4 cm, virtual
  • 1.0 cm, real
  • None of these
An object is placed in front of a convex mirror of focal length f. Find the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified
  • 2f and ∞
  • f and 2f
  • f and 0
  • None of these
A square wire of side 1cm is placed perpendicular to the principal axis of a concave mirror of focal length 15 cm at a distance of 20 cm. The area enclosed by the image of the wire is
  • 4 cm2
  • 6 cm2
  • 2 cm2
  • 9 cm2
A point object is placed on the axis of the concave mirror at a distance of 60 cm from the focal point of the mirror. Its image is formed at the point of object, then focal length of the mirror is
  • 15 cm
  • 30 cm
  • 60 cm
  • 120 cm
The field of view is maximum for
  • Plane mirror
  • Concave mirror
  • Convex mirror
  • Cylindrical mirror
The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is

  • Physics-Ray Optics-85820.png
  • 2)
    Physics-Ray Optics-85821.png

  • Physics-Ray Optics-85822.png

  • Physics-Ray Optics-85823.png
In a concave mirror experiment, an object is placed at a distance x1 from the focus and the image is formed at a distance x2 from the focus. The focal length of the mirror would be

  • Physics-Ray Optics-85825.png
  • 2)
    Physics-Ray Optics-85826.png

  • Physics-Ray Optics-85827.png

  • Physics-Ray Optics-85828.png
A convex mirror is used to form the image of an object. Then which of the following statements is wrong
  • The image lies between the pole and the focus
  • The image is diminished in size
  • The image is erect
  • The image is real
Given a point source of light, which of the following can produce a parallel beam of light
  • Convex mirror
  • Concave mirror
  • Concave lens
  • Two plane mirrors inclined at an angle of 90°
A concave mirror of focal length f (in air) is immersed in water (μ = 4/3 ). The focal length of the mirror in water will be

  • Physics-Ray Optics-85831.png
  • 2)
    Physics-Ray Optics-85832.png

  • Physics-Ray Optics-85833.png

  • Physics-Ray Optics-85834.png
A boy stands straight infront of a mirror at a distance of 30cm away from it. He sees his erect image whose height is 1/5th of his real height. The mirror he is using is
  • Plane mirror
  • Convex mirror
  • Concave mirror
  • Plano-convex mirror
Which one of the following statements is true
  • An object situated at the principle focus of a concave lens will have its image formed at infinity
  • Concave mirror can give diminished virtual image
  • Given a point source of light, a convex mirror can produce a parallel beam of light
  • The virtual image formed in a plane mirror can be photographed
An object of length 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be
  • 2 cm
  • 12 cm
  • 4 cm
  • 1.2 cm
A concave mirror is used to focus the image of a flower on a nearby well 120 cm from the flower. If a lateral magnification of 16 is desired, the distance of the flower from the mirror should be
  • 8 cm
  • 12 cm
  • 80 cm
  • 120 cm
An object is placed 40 cm from a concave mirror of focal length 20 cm. The image formed is
  • Real, inverted and same in size
  • Real, inverted and smaller
  • Virtual, erect and larger
  • Virtual, erect and smaller
A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is
  • 5 cm
  • 12 cm
  • 10 cm
  • 20 cm
All of the following statements are correct except
  • The magnification produced by a convex mirror is always less than one
  • A virtual, erect, same-sized image can be obtained using a plane mirror
  • A virtual, erect, magnified image can be formed using a concave mirror
  • A real, inverted, same-sized image can be formed using a convex mirror
If an object is placed 10 cm infront of a concave mirror of focal length 20 cm, the image will be
  • Diminished, upright, virtual
  • Enlarged, upright, virtual
  • Diminished, inverted, real
  • Enlarged, upright, real
An object is placed at 15 cm infront of a concave mirror whose focal length is 10 cm. The image formed will be
  • Magnified and inverted
  • Magnified and erect
  • Reduced in size and inverted
  • Reduced in size and erect
An object 1cm tall is placed 4 cm infront of a mirror. In order to produce an upright image of 3 cm height one needs a
  • Convex mirror of radius of curvature 12 cm
  • Concave mirror of radius of curvature 12 cm
  • Concave mirror of radius of curvature 4 cm
  • Plane mirror of height 12 cm
Match List I with List II and select the correct answer using the codes given below the lists :
Physics-Ray Optics-85841.png
  • I–B, II–D, III–A, IV–E
  • I–A, II–D, III–C, N–B
  • I–C, II–B, III–A, IV–E
  • I–B, II–E, III–D, N–C
The minimum distance between the object and its real image for concave mirror is
  • f
  • 2f
  • 4f
  • Zero
0:0:1


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