Download PTU B.Sc CS-IT 2020 March 3rd Sem 71775 Optics Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) B-Sc CSE-IT (Bachelor of Science in Computer Science) 2020 March 3rd Sem 71775 Optics Previous Question Paper

1 | M-71775 (S3)-262

Roll No. Total No. of Pages : 02
Total No. of Questions : 07
B.Sc.(Computer Science) (2013 & Onwards) (Sem.?3)
OPTICS
Subject Code : BCS-303
M.Code : 71775
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains SIX questions carrying TEN marks each and a student has
to attempt any FOUR questions.

SECTION-A
1. Answer briefly :
a) Explain the phenomenon of interference.
b) Two coherent sources of intensity ration 100:1 interfere. Deduce the ration of intensity
between maxima and minima.
c) What is the relation between phase difference and path difference?
d) Why are colours not observed in reflected light with white light in the case of thick
films?
e) Explain why an excessively thin film appears black in reflected light.
f) How many types are of diffraction?
g) How is zone plate constructed?
h) ?If we look at the sun through a piece of fine cloth we observe coloured spectra at the
site of holes in the cloth.? Why?
i) Explain Rayleigh?s criterion of resolution.
j) State and explain Malus law.
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1 | M-71775 (S3)-262

Roll No. Total No. of Pages : 02
Total No. of Questions : 07
B.Sc.(Computer Science) (2013 & Onwards) (Sem.?3)
OPTICS
Subject Code : BCS-303
M.Code : 71775
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains SIX questions carrying TEN marks each and a student has
to attempt any FOUR questions.

SECTION-A
1. Answer briefly :
a) Explain the phenomenon of interference.
b) Two coherent sources of intensity ration 100:1 interfere. Deduce the ration of intensity
between maxima and minima.
c) What is the relation between phase difference and path difference?
d) Why are colours not observed in reflected light with white light in the case of thick
films?
e) Explain why an excessively thin film appears black in reflected light.
f) How many types are of diffraction?
g) How is zone plate constructed?
h) ?If we look at the sun through a piece of fine cloth we observe coloured spectra at the
site of holes in the cloth.? Why?
i) Explain Rayleigh?s criterion of resolution.
j) State and explain Malus law.
2 | M-71775 (S3)-262

SECTION-B
2. Describe Fresnel?s biprism Describe in detail how the wavelength of monochromatic
source of light can be determined with its help.
3. Discuss the phenomenon of interference in thin films. Obtain the condition for maxima and
minima. Show that the interference patterns in the reflected and transmitted system are
complimentary.
4. Describe the principle, construction and working of Michelson?s interferometer. What is
the purpose of compensating plate?
5. Discuss the Fraunhoffer diffraction produced by a circular aperture. What is its
importance?
6. What is meant by the resolving power of a microscope? How is it related to the numerical
aperture of its objective?
7. What do you understand by double refraction? What are ordinary and extra-ordinary rays
and how will you show that these are plane polarized?







NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.

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