CS/B.OPTM/SEM-4/BO-405/2013
2013
OPHTHALMIC LENS AND DISPENSING OPTIC
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. A. Choose the correct answers for the following : 9 × 1 = 9
i) Among glass lens materials the base material is
a) CR 39 b) Crown glass
c) Plastic d) None of these.
ii) Tinting of lenses decreases the
a) transmittance b) reflection
c) scratch resistance d) all of these.
iii) Which of the following should be avoided when fitting
the high minus wearer ?
a) Squared off corners
b) High lite lens
c) Thick rim
d) An antireflective coating
iv) Polycarbonate is used in most industrial protective eyewear
because of
a) light weight b) high impact resistance
c) flexibility d) all of these
e) none of these.
v) Pin cushion effect is the result of
a) decreased magnification towards lens periphery
b) increased magnification towards lens periphery
c) dispersion
d) none of these.