Related InterviewSolutions

• When light rays enter the eye, most of the refraction occurs at the.A. crystalline lensB. outer surface of the corneaC. irisD. pupil
• The change in focal length of an eye lens is caused by the action of the.A. pupilB. retinaC. irisD. ciliary muscles
• Which of the folowing statement is correct ?A. A person with myopia can see distant objects clearlyB. A person with hypermetropia can see nearby objects clearlyC. A person with myopia can see nearby objects clearlyD. A person with hypermetropia cannot see distant objects clearly.
• Which of the following statements is correct regarding the propagation of light of different colours of white light in air ?A. Red light moves fastestB. Blue light moves faster than green lightC. All the colours of the white light move with the same speed.D. Yellow light moves with the mean speed as that of the red and the violet light.
• Why do different colours deviate through different angles on passing through a prism ?
• Physics teacher was explaning to his students in class that our eyes can live even after our death. He told them that by donating our eyes after we die, one pair of our eyes can give vision to two corneal blind people. Eye donors may being to any sex or any age group. People suffering from diabetes, hypertension, asthma or any other non-communicable disease can donate eyes. Eye Banks have been established for this purpose, where you can pledge to donate your eye after your death. Read the above passage and answer the following questions : (i) Can people who have been using spectacles or those who have been operated for cataract donate their eyes ? (ii) Why is the pledge necessary ? (iii) Do you intend to make such a pledge ? Why ?
• Due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens, a certain defect of vision arises. Write the name of this defect. Name the type of lens required by such persons to improve the vision. Explain the structure and function of such a lens.
• Nooper needs a lens of power `- 4.5 D` for correction of her vision. (a) What kind of defect in vision is she suffering from ? (b) What is the focal length and nature of corrective lens ? ( c) Draw ray diagrams showing the defected eye and correction for the defect. (d) What are the causes of this defect ?
• A person with a myopic eye cannot see objects beyond `1.2 m` distinctly. What should be the type of corrective lens to restore proper vision ?
• For a normal eye, the least distance of distinct vision isA. 25 mB. 2.5 cmC. 25 cmD. 2.5 m