JEE Questions for Physics Ray Optics Quiz 1 - MCQExams.com

The apparent flattening of the sun at sunset and sunrise is due to
  • refraction
  • diffraction
  • total internal reflection
  • interference
  • polarisation
In Ramsden eyepiece, the two planoconvex lenses each of focal length f are separated by a distance 12 cm. The equivalent focal length (in cm) of the eyepiece is
  • 10.5
  • 12.0
  • 13.5
  • 15.5
A person uses spectacles of power + 2 D. He is suffering from
  • myopia
  • presbyopia
  • astigmatism
  • hypermetropia
For normal vision, what is distance of object from eye?
  • 30 cm
  • 25 cm
  • Infinite
  • 40 cm
An astronomical telescope has a large aperture to
  • reduce spherical aberration
  • have high resolution
  • increase span of observation
  • have low dispersion
Which of the following relation is called minor equation?
  • u/v + f/u = 1/f
  • 1/v + 1/u = 1/f
  • 1/f + u = 1/v
  • uf + vf = uv
Where should a person stand straight from the pole of a convex mirror of focal length 2.0 m on its axis, so that the image formed become half of his original height?
  • – 2.60 m
  • – 4.0 m
  • – 5.0 m
  • – 2.0 m
A ray of light is incident on a plane mirror at an angle of 60°. The angle of deviation produced by the mirror is
  • 120°
  • 30°
  • 60°
  • 90°
A plane mirror produces a magnification of
  • –1
  • +1
  • zero
  • infinite
Two plane mirrors arc inclined at an angle θ. It is found that a ray incident on one mirror at any angle is rendered parallel to itself after reflection from both the mirrors. The value of θ is
  • 30°
  • 60°
  • 90°
  • 120°
Two plane mirrors inclined to each other at an angle 72°, what is the number of image formed?
  • 3
  • 5
  • 9
  • 7
A real object is placed at a distance f from the pole of a convex mirror, in front of the convex mirror. If focal length of the mirror is f, then distance of the image from the pole of the mirror is
  • 2f
  • f /2
  • 4f
  • f /4
Two plane mirrors are perpendicular to each other. A ray after suffering reflection from the two mirrors will be
  • perpendicular to the original ray
  • parallel to the original ray
  • parallel to the first mirror
  • at 45° to the original ray
To get three images of a single object, one should have two plane mirrors at an angle of
  • 60°
  • 90°
  • 120°
  • 30°
The magnification of the image when an object is placed at a distance x from the principal focus of a mirror of focal length f is

  • Physics-Ray Optics-85319.png
  • 2)
    Physics-Ray Optics-85320.png

  • Physics-Ray Optics-85321.png

  • Physics-Ray Optics-85322.png
A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a convex mirror of focal length
  • 10 cm
  • 40 cm
  • 60 cm
  • 20 cm
An object is placed at a distance 20 cm from the pole of a convex mirror of focal length 20 cm. The image is produced at
  • 13.3 cm
  • 20 cm
  • 25 cm
  • 10 cm
Which mirror is to be used to obtain a parallel beam of light from a small lamp?
  • Plane mirror
  • Convex mirror
  • Concave mirror
  • Any one of these
If two mirrors are kept at 60° to each other, then the number of images formed by them is
  • 5
  • 6
  • 7
  • 8
Transmission of light to large distances through optical fibres is based on
  • dispersion
  • refraction
  • total internal reflection
  • interference
Critical angle of light passing from glass of water is minimum for
  • red colour
  • green colour
  • yellow colour
  • violet colour
The critical angle of the medium with respect to vacuum is 30°. If the velocity of light in vacuum is 3 × 108 ms-1, the velocity of light in medium is
  • 2 ×108 ms-1
  • 1.5 ×108 ms-1
  • 3 ×108 ms-1
  • √2 × 108 ms-1
The instrument used by doctors for endoscopy works on the principle of
  • total internal reflection
  • reflection
  • refraction
  • None of the above
If sound travelling at 340 ms-1 enters water where its speed becomes 1480 ms-1, then critical angle for total internal reflection is
  • 13.3°
  • 89.7°
  • 86.7°
  • 10.3°
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by
  • Rayleigh Jeans law
  • Planck's law of radiation
  • Stefan's law of radiation
  • Wien's law
The far point of myopia person is 80 cm in front of his eye. The power of the lens required to see very distant objects is
  • – 1.25 Dioptre
  • 0.85 Dioptre
  • 1.50 Dioptre
  • 0.75 Dioptre
If the focal length of the eye piece of a telescope is double, its magnifying power m1 will be
  • 2m
  • 3m
  • m/2
  • 4m
If the aperture of a telescope is decreased the resolving power will
  • increases
  • decreases
  • remain same
  • zero
The magnifying power or a telescope is m. If the focal length of the eye piece is halved, then its magnifying power is
  • 2m
  • m/2
  • 1/2m
  • 4m
An astronomical telescope has objective and eye piece lenses of powers 0.5 D and 20 D. respectively. What will be its magnifying power?
  • 30
  • 10
  • 40
  • 20
In order to increase the angular magnification of a simple microscope, one should increase
  • the object size
  • the aperture of lens
  • the focal length of lens
  • the power of lens
The focal length of a simple convex lens used as a magnified is 10 cm. For the image to be harmed 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
Magnification at least distance of distinct vision, of a simple microscope having its focal length 5 cm is
  • 2
  • 4
  • 5
  • 6
  • 7
In a compound microscope, the intermediate image is
  • virtual, erect and magnified
  • real, erect and magnified
  • real, inverted and magnified
  • virtual, erect and reduced
A person cannot see properly beyond 2 m. Power of the lens is
  • 0.5 D
  • 1.5 D
  • – 2.5 D
  • – 0.5 D
Focal length of objective and eyepiece of telescope are 200 cm and 4 cm, respectively. What is length of telescope for normal adjustment?
  • 250 cm
  • 225 cm
  • 196 cm
  • 204 cm
A glass slab (μ = 1.of thickness 6 cm is placed over a paper. What is the shift in the letters?
  • 4 cm
  • 2 cm
  • 1 cm
  • None of these
A beaker is of height 21 cm. A liquid of refractive index 4/3 is powered to the height h, so that the apparent height becomes halved. The value of h is
  • 14 cm
  • 16 cm
  • 14/3 cm
  • 18 cm
The time required for the light to pass through a glass slab (refractive index = 1.of thickness 4 mm is ... (c = 3 × 108 ms-1, speed of light in free space).
  • 2 × 10-5 s
  • 2 × 1011 s
  • 2 × 10-11 s
  • 10-11 s
The index of refraction of diamond is 2.0, velocity of light in diamond in cm/s is approximately
  • 6 × 1010
  • 3.0 × 1010
  • 2 × 1010
  • 1.5 × 1010
If angle of incidence is twice the angle of refraction in a medium of refractive index μ, then angle of incidence is

  • Physics-Ray Optics-85333.png
  • 2)
    Physics-Ray Optics-85334.png

  • Physics-Ray Optics-85335.png

  • Physics-Ray Optics-85336.png
When a ray of light enters a glass slab from air
  • its wavelength decreases
  • its wavelength increases
  • its frequency increases
  • neither its wavelength nor its frequency changes
The optical path of monochromatic light is same if it goes through 4.0 cm of glass of 4.5 cm of water. If the refractive index of glass is 1.53, the refractive index of the water is
  • 1.30
  • 1.36
  • 1.42
  • 1.46
The refractive indices of glass and quartz w.r.t. air are 3/2 and 12/5, respectively. The refractive index of quartz w.r.t. glass is
  • 8/5
  • 5/8
  • 5/18
  • 18/5
A point source of light is kept at a depth of h in water of refractive index 4/3. The radius of the circle at the surface of water through which light emits is

  • Physics-Ray Optics-85337.png
  • 2)
    Physics-Ray Optics-85338.png

  • Physics-Ray Optics-85339.png

  • Physics-Ray Optics-85340.png
The frequency of a light wave in a material is 2 × 1014 Hz and wavelength is 5000 Å. The refractive index of material will be
  • 1.40
  • 1.50
  • 3.00
  • 1.33
A light moves from denser to rarer medium. Which of the following is correct?
  • Energy increases
  • Frequency increases
  • Phase changes by 90°
  • Velocity increases
Maximum lateral displacement of a ray of light incident on a slab of thickness t is

  • Physics-Ray Optics-85342.png
  • 2)
    Physics-Ray Optics-85343.png

  • Physics-Ray Optics-85344.png
  • t
When a ray of light is incident normally on a surface, then
  • total internal reflection takes place
  • it passes undeviated
  • it undergoes dispersion
  • it gets absorbed by the surface
A focal length of a lens is 10 cm. What is power of a lens in dioptre?
  • 0.1 D
  • 10 D
  • 15 D
  • 1 D
0:0:1


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