Waec Physics 1990 Past Questions and Answers

Question 31:

• WAEC 1990

Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?

A. At F
B. Beyond C
C. Between O and P
D. Between P and F
E. Between F and C

Question 32:

• WAEC 1990

A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?

A. At the focal point
B. At the centre of curvature
C. Beyond the centre of curvature
D. Between the focal point and the pole
E. Between the focal point and the center of curvature

Question 33:

• WAEC 1990

The diagram above shows an incident ray A, inclined at angle of 50^o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

A. Sin50^o/sin40^o
B. Sin40^osin50^o
C. Sin90^o/sin50^o
D. Sin40^o/sin90^o
E. Sin90^o/sin40^o

Question 34:

• WAEC 1990

The diagram above shows an incident ray A, inclined at angle of 50^o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?

A. Sin50^o/sin40^o
B. Sin40^osin50^o
C. Sin90^o/sin50^o
D. Sin40^o/sin90^o
E. Sin90^o/sin40^o

Question 35:

• WAEC 1990

The eye defect illustrated by the diagram above is

A. Astigmatism
B. Long sightedness
C. Loss accommodation
D. Short sightedness
E. Colour blindness