Optics

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. The property of the eye to adjust the focal length of eye lens is called .
2. The human eye forms the image of an object at its .
3. The action of holding the eye lens changes the focal length of eye lens enabling the eye to focus the image of objects at varying distances.
4. Change in size of the pupil by the takes some time.
5. In bright sunlight, of an eye contracts so as to allow only a little light to enter the eye.
6. blindness is independent of the defects of vision.
7. Red colour has largest and hence the minimum frequency.
8. of light involves change in direction of light on striking a scatterer.
9. The far point of a myopic eye is at 50 cm. The power of the lens to correct his vision is - D.
10. The focal length is in case of convex lens.