The number of cones in the human eye is more than the number of rods.
  • True
  • False
A parallel beam of light falling on the eye gets focus on the retina because of refractions at
  • various surfaces in the eye
  • the cornea
  • the vitreous humor
  • the crystalline lens
The number of surfaces bounding a prism is
  • 1
  • 5
  • 3
  • 6
The wavelengths $\lambda_{v} $, $\lambda_{y}$ and $\lambda_{r}$ corresponding to violet, yellow and red lights are and respectively.
  • $\lambda_{v} < \lambda_{y} < \lambda_{r}$
  • $\lambda_{y} < \lambda_{v} < \lambda_{r}$
  • $\lambda_{y} < \lambda_{r} < \lambda_{v}$
  • $\lambda_{v} > \lambda_{y} > \lambda_{r}$
The combination responsible for admitting different amounts of light into the eye is
  • rods and cones
  • ciliary muscles and crystalline lens
  • ciliary muscles and pupil
  • iris and pupil
When the eye is focused on an object very far away, the focal length of the eye-lens is
  • minimum
  • half its maximum focal length
  • equal to that of the crystalline lens
  • maximum
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