BO/III/09
Professional Course Examination, November 2018
3rd Semester
BACHELOR OF OPTOMETRY
Paper IX
Optometric Optics—I
Full Marks 40
Pass Marks 20
Time 2 hours
The figures in the margin indicate full marks for the questions
Answer Question No. 1 which is compulsory and any seven from the rest
1. What is transposition? Transpose 2×00 -0×75 ´145* 1×5=5
Alternate spherocylinder form
Cross cylinder form
Represent it in the optical cross
Calculate the spherical equivalent from the given prescription.
2. Explain monochromic aberration in detail with neat diagrams. 5
3. Explain magnification and minification of high plus lens and high minus
lens respectively. 2½×2=5
4. Define a prism along with a neat diagram. Write the properties of a prism
OR describe the refraction through a prism with diagram.
/395 1 Contd.
5. Define Prentice's rule. Explain the prismatic effect of a spherocylinder OR
planocylinder lenses.
6. What are the units used for a prism? Explain. Describe Fresnel and
Rotatory prisms.
7. List out the terms used to describe the parts of a lens and explain along
with diagrams. 5
8. Fill in the blanks 1×5=5
Light is an energy, which has a dual nature.
of light is the change of pathway when travelling from one
medium to another medium.
tilt is the alignment of the bottom of the frame away from the
cheeks.
is the unit power of a lens.
The refractive index of crown glass is
9. What are the different methods for specifying the refracting power of lens?
Explain any three.
10. What is a lens? Describe the different lens forms with diagrams.