WBUT 2013 VISUAL OPTICS ( OPTICS – IV ) Question Paper Code [CS/B.OPTM/SEM-4/BO-401/2013]

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CS/B.OPTM/SEM-4/BO-401/2013

2013

VISUAL OPTICS ( OPTICS – IV )

Time Allotted : 3 Hours                                      Full Marks : 70

The figures in the margin indicate full marks.

Candidates are required to give their answers in their own words

as far as practicable.

GROUP – A

( Multiple Choice Type Questions )

1. Choose the correct alternatives for the following : 10 × 1 = 10

i) Pelli Robson chart is used for

     a) V. A. testing

     b) Glare testing

     c) Contrast sensitivity testing

      d) Colour vision testing.

ii) 1 mm shortening of axial length of eyeball can produce

          a) 1D of hyperopia           b) 3D of hyperopia

         c) 1D of myopia                d) 3D of myopia.

iii) If a myopic patient shifts from spectacle to contact lens

          a) accommodative & vergence demand increase

          b) accommodative & vergence demand decrease

          c) accommodative demand increases but vergence

              demand decreases

         d) no change occurs in accommodative & vergence

             demand.

iv) Spherical equivalent of +2·00/–2·50 D cyl 90° is

         a) + 3·25 Dsph               b) – 0·50 Dsph

         c) + 0·75 Dsph                d) + 0·50 Dsph. 

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