1992 - WAEC Physics Past Questions and Answers - page 3
21
A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.
A
i
B
2i
C
90o-i
D
90o+ i
correct option: e
Users' Answers & Comments22
Images formed by a convex mirror are always
A
inverted, real and diminished
B
inverted, virtual and diminished
C
erect, virtual and diminished
D
erect, real and magnified
correct option: c
Users' Answers & Comments23
Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It
A
suffers a displacement at the point of emergence
B
emerges parallel to the incident ray
C
is partly reflected at the point of incidence
D
is deviated at the point of emergence
correct option: a
Users' Answers & Comments24
In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?
A
f= the slope of the graph
B
f= the intercept on the 1/u axis
C
f =the intercept on the 1/v axis
D
f = reciprocal of the slope
correct option: e
Users' Answers & Comments25
The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens
A
-3.3cm
B
3.3cm
C
10.0cm
D
15.0cm
26
As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?
A
III and IV only
B
I and III only
C
IV only
D
III only
correct option: e
Users' Answers & Comments27
A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?
A
30cm
B
25cm
C
20cm
D
15cm
28
The eye defect illustrated in the diagram above can be corrected by a
A
convex mirror
B
concave mirror
C
diverging lens
D
converging lens
correct option: c
Users' Answers & Comments29
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?
A
20.0cm
B
47.5cm
C
50.0cm
D
52.5cm
30
Which of the following is used for controlling the amount of light entering the eye?
A
Cornea
B
Pupil
C
Iris
D
Optic nerve
correct option: c
Users' Answers & Comments