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Ray Optics Test - 4

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Ray Optics Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Magnification for spherical mirrors m is given by

    Solution

    m = -(v/u)
    m = - image distance/object distance

  • Question 2
    1 / -0

    Total internal reflection can take place only if light is travelling from

    Solution
    1. Light should travel from denser medium to rarer medium
    2. Angle of incidence > critical angle.
  • Question 3
    1 / -0

    Total internal reflection can take place only if

    Solution

  • Question 4
    1 / -0

    Thin lens approximation for a lens is

    Solution

    For thin lens, lens equation is given by (1/v) − (1/u) = 1/f

  • Question 5
    1 / -0
    Material A has a critical angle iA and material B has a critical angle iB (iB > iA). Which of the following statements are true?

    (i) Light can be totally internally reflected when it passes from B to A.
    (ii) Light can be totally internally reflected when it passes from A to B.
    (iii) Critical angle for total internal reflection is iB - iA.
    (iv) Critical angle between A and B is .
  • Question 6
    1 / -0

    According to Snell’s law


    Solution

    The ratio of sine of angle of incidence and sine of angle of refraction is constant for a given pair of media for a given wavelength of light.

  • Question 7
    1 / -0
    Each quarter of a vessel of depth 'H' is filled with liquids of refractive indices n1, n2, n3 and n4 from the bottom. The apparent depth of the vessel, when observed normally, is
  • Question 8
    1 / -0

    Refraction is

    Solution

    Refraction is a phenomenon that often occurs when light travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media,  velocity of light is altered, usually causing a change in direction.

  • Question 9
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    A light of wavelength 5890 falls normally on a thin air film. The minimum thickness of the film, such that the film appears dark in reflected light is
  • Question 10
    1 / -0
    For the given lens, which of the following statements is true for rays coming from infinity?

  • Question 11
    1 / -0

    According to Cartesian sign convention.

    Solution

    According to New Cartesian sign conventions, all distances (object distance, image distance, focal length, radius of curvature) are measured from pole of mirror / optical centre of lense.

  • Question 12
    1 / -0
    Monochromatic light is incident on  two slits 0.2 mm apart. If the first order bright fringe is 4.8 mm from the central bright spot on a screen located a distance of 1.5 m from the double slit, what is the wavelength of the light (in nm)?
  • Question 13
    1 / -0

    Light rays from a point object

    Solution

    light waves emerging from point source radiates in all the directions.

  • Question 14
    1 / -0
    The dispersive power of a material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is
  • Question 15
    1 / -0
    An electric bulb is suspended at a height h from the centre of a table having a surface of radius r. If the illuminance at the edge of the table is 1/8th as that at the centre, then the height of the bulb in terms of r is 
  • Question 16
    1 / -0
    The width of a single slit, if the first minimum is observed at an angle of 2o with a light of wavelength 6980 is
  • Question 17
    1 / -0
    Light of wavelength 6500  is incident on a slit. If the first minima for red light is at 30o, then the slit width is
  • Question 18
    1 / -0
    Which of the following graphs is showing the dependence of intensity of transmitted light on the angle between the polariser and the analyser?
  • Question 19
    1 / -0
    The minimum deviation produced by a glass prism having an angle of 60o is 30o. If the velocity of light in vacuum is 3 x 1010 cm/s, then what is its velocity in glass?
  • Question 20
    1 / -0

    According to the mirror equation

    Solution

    where f is focal length, u is object distance and v is image distance.

  • Question 21
    1 / -0

    For a rectangular slab, refraction takes place at

    Solution

    At one surface, light enters from air into glass and at the other surface light enters from glass into air.

  • Question 22
    1 / -0

    Lens maker’s formula is

    Solution

  • Question 23
    1 / -0
    A ray of light from a denser medium strikes a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90o with each other. The angles of reflection and refraction are r and r', respectively. The critical angle is
  • Question 24
    1 / -0

    Optical fibre communication uses the principle of

    Solution

  • Question 25
    1 / -0
    If the separation between a screen and a source is increased by 2%, what would be the effect on the intensity?
  • Question 26
    1 / -0
    A slit of width 'a' is illuminated by red light of wavelength 6500 . If the first minimum falls at θ = 30o, then the value of 'a' is
  • Question 27
    1 / -0

    For small angles Snell’s law becomes

    Solution

  • Question 28
    1 / -0
    If white light is used in the Newton's rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to : 
  • Question 29
    1 / -0

    According to Cartesian sign convention, the heigFocal length of a mirror is given byhts measured

    Solution

    R = 2f = 2 (focal length)

  • Question 30
    1 / -0

    A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is

    Solution

    We know that, when a light ray goes from one medium to other medium, the frequency of light remains constant.

    We also know v ∝ λ,

    Since, the wavelength of red coloured light is highest wavelength. Hence, it has highest speed.

    Therefore, the red colour will emerge first after travelling through the slab.

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