Geometrical and Waves Optics (PHYS2203)
BSc, Physics - PHYS
Semester: Second Semester
Level: 200
Year: 2017
REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
Peace-Work-Fatherland P.O BOX 39 Bambili
School/Faculty:__Science_______Department: _Physics_______Lecturer(s): Dr. Zambo__
Course Code:_PHYS2203_Course Title: Geometric and Wave Optics___Date: 31/07/2017__
Hall: ____Time: 14:30-17:30
Instructions: Answer clearly all questions. Put in box the final result
Exercise 1 (5 marks)
A laser in a compact disc player generates light that has a wavelength of 780 nm in air.
1) Find the speed of this light it enters the plastic of a compact disc (n-1.55).
2) What is the wavelength of this light in the plastic?
Exercise 2 (5 marks)
The light beam shown in figure 1 makes an angle of
20.0° with the normal line NN’ in the linseed oil.
Determine the angles and ′. The indices of
refraction of linseed oil and water are respectively
1.48 and 1.33.
Figure 1:
Exercise 3 (10 marks)
In the air, consider a half sphere of radius R, center C and index n. A parallel light rays (i.e.
the object is at infinity ) arrive perpendicular at the entrance face which is plane. Determine in
function of the incidence angle, the index of the medium, the position of the image relative to the
half sphere.
Exercise 4 (15 marks)
We consider a centered system assimilated as a sphere of apex E, radius = 4.5 and
index = 1.5. the system is surrounded at the left by the water with index
= 1.33, and the right
by the air.
Exercise 5 (15 marks)
A spherical mirror has a focal length of 15.0 cm. construct a ray diagram of the image for an
object distance of:
a) 25.0 cm. b) 15 cm c) 10cm.
Exercise 6 (20 marks)
Determine the position, of the image given by a convergent lens when the position of the
object varies between −∞ and +∞ on the axis of the lens.
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