Waec Physics Past Questions For Year 1992
Question 26
Which of the following is used for controlling the amount of light entering the eye?
- A. Cornea
- B. Pupil
- C. Iris
- D. Optic nerve
- E. Ciliary muscle
Question 27
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.
Question 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
- E. piano-converging lens
Question 29
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 30
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
