Available Answers

1. 1.

   Tick (√) the correct option:

   1. Which of the following is luminous object?
      1. Candle
      2. Moon
      3. Book
      4. Table
   2. A real image
      1. can be taken on a screen
      2. is always inverted
      3. both (a) and (b)
      4. neither (a) nor (b)
   3. Image formed by a plane mirror is
      1. smaller than the object
      2. bigger than the object
      3. same size as that of object
      4. highly magnified
   4. In a kaleidoscope, three plane mirrors are inclined at an angle of
      1. 60°
      2. 65°
      3. 90°
      4. 95°
   5. Splitting of white light into seven constituent colours is called
      1. scattering
      2. dispersion
      3. reflection
      4. rectilinear propagation
   6. According to laws of reflection,
      1. angle of incidence is greater than angle of reflection.
      2. angle of incidence is smaller than angle of reflection.
      3. angle of incidence is equal to angle of reflection.
      4. none of the above.
   7. If two plane mirrors are kept at right angle, number of images formed is equal to
      1. 3
      2. 4
      3. 6
      4. 5
   8. Light enters the eye through the
      1. cornea
      2. pupil
      3. iris
      4. yellow spot
   9. The image of an object is formed on the
      1. cornea
      2. pupil
      3. iris
      4. retina
2. 2.

   Fill in the blanks:

   1. ______________ is a natural luminous object.
   2. Images which can be taken on a screen are called ______________ images.
   3. The phenomenon of splitting of white light after passing through a prism is ______________.
   4. The action of ciliary muscles due to which we are able to see nearby as well as far-off objects is called ______________
   5. The defect of vision due to which one can see clearly far-off objects but unable to see clearly nearby objects is called ______________.
3. 3.

   Tick (√) the correct and cross (x) the wrong statement:

   1. Least distance of distinct vision is 10 cm.
   2. In myopia, we are unable do see far-off objects clearly.
   3. Cataract is an eye defect.
   4. A rectangular array of raised dots is called a Braille cell.
   5. Permanent blindness can be cured by surgery.
4. 4.

   Match the followings:

   Column A	Column B
   1. Natural Luminous source	a. CFL
   2. Non-luminous source	b. Bulb
   3. Hot source of light	c. Sun
   4. Cold source of light	d. Moon

    

5. 5.

   Find the odd one out:

   1. Sun, Moon, Glow-worm, Tubelight
   2. Spectrum, Prism, Reflection, Dispersion
   3. Cornea, Iris, Pupil, ear drum
6. 6.

   Which lens is used to correct hypermetropia?