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A student sitting at the back of the cla...

A student sitting at the back of the classroom cannot read clearly the letters written on the blackward. What advice will a doctor give to her ? Draw ray diagram for the correction of this defect.

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The student who can not read clearly the letters written on blackboard is suffereing from myopia (short sightedness). A doctor will advise her to wear spectacles with a concave lens of suitable power. For ray diagram, ( c)
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A student sitting in the last row of the class-room is not able to read clearly the writing on the blackboard. (a) Name the type of defect he is suffering from. (b) How can this defect by corrected ?

A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Draw the diagram to show this defect?

Knowledge Check

  • A student sitting on the last bench in the class cannot read be writing on the blackboard clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student ?

    A
    The near point of his eyes has receded away.
    B
    The near point of his eyes has come closer to him.
    C
    The far point of his eyes has receded away.
    D
    The far point of his eyes has come closer to him.

  • A student sitting on the last bench can read the letters written on the blackboard but is not able to read the latters written in his text book. Which of the following statements is correct?

    A
    The near point of his eyes has receded away
    B
    The near point of his eyes has come closer to him
    C
    The far point of his eyes has come closer to him
    D
    The far point of his eyes has receded away

  • A student is asked to sit at the last bench because he cannot read the letters written on blackboard clearly from front seat but still is unable to read the letters written in his textbook. Which of the following statements is correct?

    A
    The near point has come closer to him
    B
    The far point has come closer to him
    C
    The near point has receded away
    D
    The far point has receded away

    • Similar Questions

    Explore conceptually related problems

    A student sitting at the backbench in a class has difficulty in reading. What could be his defect of vision? Draw ray diagrams to illustrate the image formation of the blackboard when he is seated at the (i) back seat (ii) front seat. State two possible causes of this defect. Explain the method of correcting this defect with the help of a ray diagram.

    A 14 year old student is not able to see clearly the questions written of the black board placed at a distance of 5 m from him. Draw the diagram to show how this defect can be corrected.

    Write the importance of ciliary muscles in the human eye. Name the defect of vision that arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are required by the persons suffering from this defect to see the objects clearly? Akshay, sitting in the last row in his class, could not see clearly the words written on the blackboard. Wizen the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay's parents advising them to get his eyesight checked. In the context of the above event, answer the following questions: (a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect? (b) State the values displayed by the teacher and Salman. (c) In your opinion, in what way can Akshay express his gratitude towards the teacher and Salman?

    Write the importance of ciliary muscles in the human eye. Name the defect of vision that arises due to gradual weakening of the ciliary muscles in old age. What type of lenses are required by the persons suffering from this defect to see the objects clearly? Akshay, sitting in the last row in his class, could not see clearly the words written on the blackboard. Wizen the teacher noticed it, he announced if any student sitting in the front row could volunteer to exchange his seat with Akshay. Salman immediately agreed to exchange his seat with Akshay. He could now see the words written on the blackboard clearly. The teacher thought it fit to send the message to Akshay's parents advising them to get his eyesight checked. In the context of the above event, answer the following questions: (a) Which defect of vision is Akshay suffering from? Which type of lens is used to correct this defect? (b) State the values displayed by the teacher and Salman. (c) In your opinion, in what way can Akshay express his gratitude towards the teacher and Salman?

    A student find the writing on the blackboard as blurred and unclear when sitting on the last desk in the classroom. He, however, sees it clearly when sitting on the front desk at an approximate distance of 2m from the blackboard. Draw ray diagrams to illustrate the formation of image of the blackboard writing by his eye-lens when he is seated at the (i) last desk (ii) front desk. Name of the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps from to see clearly.

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