Waec Physics 2012 Past Questions and Answers

Question 26:

• WAEC 2012

An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.

A. 2.5 cm
B. 3.0cm
C. 5.0cm
D. 25.0cm

Question 27:

• WAEC 2012

A ray of light passes from air to water to glass to air. Given that the refractive index for light passing from air to water is \(\frac{4}{3}\) and air to glass is \(\frac{3}{2}\), calculate the refractive index of glass relative to water

A. 0.50
B. 0.67
C. 0.75
D. 1.13

Question 28:

• WAEC 2012

An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between

A. F and X
B. X and C
C. C and F
D. F and 2F

Question 29:

• WAEC 2012

An object is placed 10cm from a converging lens of foal length 15cm. Calculate the magnification of the image formed

A. 3.0
B. 1.5
C. 0.6
D. 0.3

Question 30:

• WAEC 2012

A telescope is said to be in normal adjustment when the

A. Focal length of he objective is greater than that of the eyepiece
B. Focal length of the eyepiece is greater than that of the objective
C. Focal length of the eyepiece is equal to that of the objective
D. Objective focal point coincides wih that of the eyepiece