Waec Physics 2003 Past Questions and Answers

Question 21:

• WAEC 2003

A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length

A. 100cm
B. 33cm
C. 29cm
D. 20cm

Question 22:

• WAEC 2003

The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir

A. 2.35m
B. 1.35m
C. 1.00m
D. 0.35m

Question 23:

• WAEC 2003

A converging lens has a focal length of 5cm. Determine its power

A. +20.0
B. +0.2
C. -20.00
D. -0.2

Question 24:

• WAEC 2003

Which of the following pairs of rays shows the widest separation in the spectrum of white light?

A. Green and blue
B. Orange and indigo
C. Blue and violet
D. Red and yellow

Question 25:

• WAEC 2003

Which of the following statements about the human eye and the camera is correct?

A. Both form virtual image of objects
B. The image formed by the eye is upright in the retina while that formed by the camera is inverted on the film
C. The inside of both of them is blackened to absorb unwanted light
D. The focal length of both eye lens and the camera lens can be varied