Waec Physics 1992 Past Questions and Answers

Question 26:

• WAEC 1992

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
E. 20.0cm

Question 27:

• WAEC 1992

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
E. II only

Question 28:

• WAEC 1992

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
E. 10cm

Question 29:

• WAEC 1992

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
E. Piano-converging lens

Question 30:

• WAEC 1992

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
E. 125.0cm.