Multiple Choice Questions (1 Marks each)
1. The Image formed in retina in human eye
a) Virtual and erect
b) Real and Inverted
c) Virtual and Inverted
d) Real and Erect
2. The Change in focal length of Human eye is caused due to
a) Cilliary Muscles
b) Pupil
c) Cornea
d) Iris
3. The light sensitive cells of retina which are sensitive to the intensity of light are
a) Cones
b) Rods
c) Both rods and cones
d) None of these
4. The focal length of the lens increases when eye muscles
a) Are relaxed and lens becomes thinner
b) Contract and lens become thicker
c) Are relaxed and lens become thicker
d) Contract and lens become thinner
5. In long sightedness image is formed
a) On retina
b) In front of retina
c) Behind retina
d) On blind spot
6. Colour Blind person may have
a) Normal Vision
b) Defective vision
c) Sometimes normal and sometimes defective vision
d) Cannot say
7. The phenomenon of light involved in the formation of rainbow are
a) Reflection, refraction and dispersion
b) Refraction, dispersion, internal reflection and refraction
c) Reflection, dispersion , internal reflection and refraction
d) Refraction, dispersion, scattering and total internal reflection.
8. Variable focal length of eye lens is responsible for
a) Accommodation of eye
b) Persistence of vision
c) Colour Blindness
d) Least distance of distinct vision
9. A beam of white light when passes through a glass prism a spectrum is observed.
But when same beam of light passes through hollow glass prism then
(a) Spectrum is same
(b) Spectrum become brighter
(c) There will be no spectrum
(d) Colours of spectrum reversed
10. Sheela cannot read newspaper when she holds is closer than 100cm. The defect
in her eye and the power of lens prescribed to her is
(Normal eye near point = 25 cm)
a) Myopia with +3D lens
b) Myopia with -3D lens
c) Hypermetropia with -3D lens
d) Hypermetropia with +3D lens
Short Answer Type Questions
1. Differentiate between Hypermetropic eye and myopic eye with appropriate diagram.
2. What is presbyopia? Write two causes of this defect. Name the type of lens which can be
used to correct presbyopia.
3. Describe the formation of rainbow in the sky with the help of a diagram.
Long Answer Type Questions
1. (a) Draw a simple diagram of Human Eye and label clearly the cornea, Iris, pupil, Cilliary
muscles, Eye Lens, Retina, Optic nerves, Blind spot.
(b)Write the functions of each of the mention parts of human eye
(1) Cornea (2) Iris (3) Pupil (4) Cilliary muscles (5) Retina
2. A student suffering from myopia is not able to see distinctly the object placed beyond
5 m.
List two possible reasons due to which this defect of vision may have arisen. With the
help of ray diagrams explain.
(a) Also student not able to see distinctly the objects placed at 5cm from his eyes.
Explain
(b) The type of corrective lens used for myopia to restore proper vision and how this
defect is correct by the use of this lens.
3. What is dispersion of white light? Draw a labeled diagram to illustrate the recombination
of the spectrum of white light. Why it is essential that the two prisms used for the purpose
should be identical and placed in an inverted position with respect to each other.
