Class X

Which phenomenon is responsible for the twinkling of stars?
  1. Atmosphere reflectio
  2. Atmosphere refraction
  3. Reflection
  4. Total internal reflection
The least distance of distinct vision for a young adult with normal vision is
  1. 25m
  2. 20m
  3. 25cm
  4. 20cm
The change in focal length of an eye lens is caused by the action of the
  1. Pupil
  2. Retina
  3. Ciliary muscles
  4. Iris
Which of the following are the primary colours?
  1. Red, Blue, Yellow
  2. Red, Green, Violet
  3. Yellow, Green Blue
  4. Red, Green, Blue
Which of the following optical phenomenon is used in cinematography or movie projectors?
  1. accomodation
  2. persistence of vision
  3. interference
  4. short sightednes
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