• 1. 
    Which description best matches how a camera works?

  • Light is gathered from a tiny area of a well-illuminated specimen close by. Then it is brought into focus by a lens.
  • Light hits a lens, bending it in one direction and a new direction as it leaves. It then converges together and creates a real image, where it is planted onto film through a chemical reaction.
  • White light travels through pixels, where it then passes through a prism and the 3 primary colors become dispersed so multiple colors are displayed.
  • Light is collected from distant objects and brought into focus. The eyepiece then takes the light and spreads it out in your field of vision.
  • 2. 
    Which description best matches holograms?

  • atoms are excited and release photons, which bounce back and forth until they are emitted.
  • Light is gathered from a tiny area of a well-illuminated specimen close by. Then it is brought into focus by a lens.
  • a laser hits a splitter and then hits mirrors, creating a 3-dimensional image
  • light travels down a "hallway" and is then decoded at the end by an optical receiver
  • 3. 
    What are the main parts of a laser?

  • Objective lens (can be either mirrors or glass), eyepiece, aperture, pupil
  • A laser, shutter, beam splitter, lenses, mirrors and film.
  • A flash tube, two mirrors, atoms
  • Cladding, core and buffer coating
  • 4. 
    Which best matches the description of a microscope?

  • The instrument collects lots of light from distant objects and brings that light into focus, taking up more space in your field of vision.
  • light hits a lens and gets bent, creating a real image. the image is then planted onto film and leaves an impression by a chemical reaction
  • atoms are excited and release photons, which bounce back and forth until they are emitted out of the device.
  • Light is gathered from a tiny area of a well-illuminated specimen close by. Then it is brought into focus by a lens.
  • 5. 
    The power of a thin convex lens of glass is 5 D. When it is immersed in a liquid, then it behaves like a divergent lens of focal length 100 cm. The refractive index of the liquid is:(Given, refractive index of glass = μ = 1.5)

  • 3/5
  • 1/2
  • 2/3
  • 5/3
  • 6. 
    The eyepiece of an astronomical telescope has a focal length of 10 cm. The telescope is focused for normal vision of distant objects when the tube length is 1 m. The focal length of the objective is:

  • 20 cm
  • 10 cm
  • 90 cm
  • 100 cm
  • 7. 
    Tom’ lenses of focal lengths ± 15 cm and ± 150 cm are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be

  • + 15 cm
  • + 150 cm
  • – 150 cm
  • – 15 cm
  • 8. 
    A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power of the combination (in dioptres) is

  • zero
  • 25
  • 50
  • infinity
  • 9. 
    An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then

  • the magnification is 1000
  • the length of the telescope tube is 20.02 m
  • the image formed of inverted
  • all of these
  • 10. 
    The refractive index of the material of an equilateral prism is √3. What is the angle of minimum deviation?

  • 45°
  • 60°
  • 37°
  • 30°
  • 11. 
    A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is:

  • 10
  • 20
  • 50
  • 25
  • 12. 
    The objective of a compound microscope is essentially:

  • A concave lens of small focal length and small aperture
  • Convex lens of small focal length and large aperture
  • Convex lens of large focal length and large aperture
  • Convex lens of small focal length and small aperture
  • 13. 
    Finger prints are observed by the use of :

  • Telescope
  • Microscope
  • Newtonian telescope
  • Concave lens
  • 14. 
    The angular magnification of a system is less than one. Does it mean that the image formed is inverted?

  • Yes
  • No
  • 15. 
    The optical density of turpentine is higher than that of water while its mass density is lower. Figure shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in figure the path shown is correct?

  • 1
  • 2
  • 3
  • 4
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