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Ray Optics Test - 6

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Ray Optics Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A laser beam is used for locating distant objects because it
    Solution
    A laser beam is used for locating distant objects because it is collimated.
  • Question 2
    1 / -0
    The light gathering power of a camera lens depends on
    Solution
    The light gathering power of a lens is the ability of a lens to collect a lot more light than the human eye. The light gathering power of a camera lens depends on ratio of focal length and diameter which is called f-number.
  • Question 3
    1 / -0
    To get three images of a single object, one should have two plain mirrors at an angle of:
    Solution
  • Question 4
    1 / -0
    A ray falls on a prism ABC (AB = BC) and travels as shown in figure. The least value of refractive index of material of the prism, should be:

    Solution
  • Question 5
    1 / -0
    For the given lens, which of the following statements is true for rays coming from infinity?

    Solution
    Since the lens is made of two layers of different refractive indices, so for a given wavelength of light, it will have two focal lengths and will form two images at two different points as there are two 's and .
  • Question 6
    1 / -0
    An air bubble is contained inside water. It will behave as a:

    Solution
  • Question 7
    1 / -0
    The refractive index of the material of a prism is and its refracting angle is 300. From one of the refracting surfaces of the prism, an inwards mirror is made. A beam of monochromatic light entering the prism from the other face will retrace its path after reflection from the mirrored surface, if its angle of incidence on the prism is:
    Solution
  • Question 8
    1 / -0
    The principal section of a glass prism is an isosceles triangle ABC with AB = AC. One face AC of the glass prism is silvered as shown in the figure. If a ray is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to it, what is the measure of angle BAC?

    Solution


    From the figure,
    β = 2α
    In the given triangle, 2α + 2α + α = 180°
    5α = 180°
    α = 36°
  • Question 9
    1 / -0
    In Ramsden eyepiece, the focal length of each lens is F. The distance of the image formed by the objective lens from the eye lens is
    Solution
  • Question 10
    1 / -0
    One of the refracting surfaces of a prism of refractive indexis silvered. The angle of the prism is equal to critical angle of a medium of refractive index 2. A ray of light incident on the unsilvered surface passes through the prism and retraces its path after reflection at the silvered face. Then, the angle of incidence on the unsilvered surface is
    Solution
  • Question 11
    1 / -0
    Total internal reflection takes place
    Solution
    Total internal reflection is the phenomenon of reflection of light into a denser medium from an interface of denser medium and rarer medium. The essential conditions for total internal reflection are:
    (i) Light should travel from a denser medium to a rarer medium.
    (ii) Angle of incidence in denser medium should be greater then the critical angle for the pair of media in contact.
    We may define critical angle fora pair of media in contact as the angle of incidence in the denser medium corresponding to which angle of refraction in the rarer medium is 90°. It is represented by C and its value depends on the nature of media in contact.
    Note: In total internal reflection, 100% of incident light is reflected back into the same medium, and there is no loss of intensity. That is why images formed by total internal reflection are much brighter than those formed by mirrors or lenses.
  • Question 12
    1 / -0
    Width of the central maxima of the diffraction varies
    Solution
  • Question 13
    1 / -0
    A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringe on either side of the central bright fringe is:
    Solution

  • Question 14
    1 / -0
    In Young's double slit experiment, the fringe width is β, the entire arrangement is placed in a liquid of refractive index n, the fringe width becomes:
    Solution
  • Question 15
    1 / -0
    A source is at some distance from an obstacle. The distance between the obstacle and the point of observation is 'b' and the wavelength of light is 'λ'. Then, the average distance of nth Fresnel zone from the point of observation will be _______.
    Solution
    According to Fresnel's the entire wave front can be divided into a large number of parts of zones which are known as Fresnel's half period zones (HPZ's). The resultant effect at any point on screen is due to the combined effect of all the secondary waves from the various zones. The average distance of nth Fresnel zone from the observation point will be b + .
  • Question 16
    1 / -0
    When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarizing angle:
    Solution
  • Question 17
    1 / -0
    A movie projector,projects an image of length 3.5 m of a 35 mm movie film on a screen.Neglecting absorption of light by the film and the air,the ratio of the illumination on the screen decreases in the ratio
    Solution
  • Question 18
    1 / -0
    If the pitch of sound from a source appears to drop by 10% to a moving person, then what is the velocity of motion? (Velocity of sound = 330 m/s)
    Solution
  • Question 19
    1 / -0
    A beam of light of wavelength 600 nm from a distance source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
    Solution
  • Question 20
    1 / -0
    When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is
  • Question 21
    1 / -0
    Two coherent sources whose intensity ratio is 81 : 1 produce interference fringes. The ratio of minimum to maximum intensity i.e., Imin : Imax is
    Solution
  • Question 22
    1 / -0
    Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids, then the intensity of light emerging from the last polaroid will be :
  • Question 23
    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
    Solution
    Longitudinal chromatic aberration = ×
    Given, = 0.08 and = 20
    So, required answer = 0.08 × 20 = 1.6 cm
  • Question 24
    1 / -0
    When light is incident on a diffraction grating the zero order principal maximum will be
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