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SAI INTERNATIONAL SCHOOL
                                                          Class8
                                                  Home Assignment
                                                   Subject-Physics
                                                        CH- Light
                                   Subtopic- Vision defects & Braille system


               INSTRUCTIONS:
                    For Assertion& Reason question follow the following directions.
                       DIRECTION: Each of these questions contains an Assertion followed by Reason. Read them
                       carefully and answer the question on the basis of following options. You have to select the one
                       that best describes the two statements.
                       (a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
                       (b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
                       Assertion.
                       (c) If Assertion is correct but Reason is incorrect.
                       (d) If Assertion is incorrect but Reason is correct.
                       (e) If Assertion & Reason both are incorrect.
                   1.    Assertion: A person suffering from hypermetropia can see only distant object          1
                         clearly
                         Reason: Hypermetropia can be corrected by using convex lens of suitable
                         focal length
                   2.    Assertion: A person suffering from cataract cannot see clearly.                       1
                         Reason: The eye lens becomes cloudy in a cataract patient.
               Fill in the blanks
                   3.    The resource for visually challenged persons is __________.                           1

                   4.    Myopia can be corrected by using _______ lens.                                        1


                   5.    Braille has _____________ dot patterns or characters.                                 1

               MCQ
                   6.    Which part of the eye gets affected if someone is suffering from cataract?            1
                            a) Retina
                            b) Pupil
                            c) Eye lens
                            d) Cilliary muscles
                   7.    How many cells are there in a Braille character?                                      1
                            (a) 12
                            (b) 9
                            (c) 3
                            (d) 6
                   8.    Differentiate between myopia and hypermetropia.                                       2
                   9.    Which part of the eye gets affected if someone is suffering from cataract? How 2
                         is it treated?
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