Waec Physics 2011 Past Questions and Answers

Question 26:

• WAEC 2011

A ray undergoes a minimum deviation at 40^o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism

A. 1.48
B. 1.50
C. 1.53
D. 1.67

Question 27:

• WAEC 2011

Total internal reflection occurs in an optical prism when light rays

A. Travel from the prism into an optically denser medium
B. Are incident in the prism at an angle greater than the critical angle
C. Are incident normally in the prism
D. Travel from the prism to the air

Question 28:

• WAEC 2011

The speed of light in a certain medium is V while its speed in a vacuum is C. The absolute refractive index of the medium is

A. C + V
B. \(\frac{C}{V}\)
C. \(\frac{V}{C}\)
D. C - V

Question 29:

• WAEC 2011

An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance

A. 1.3cm
B. 8.6cm
C. 35.0cm
D. 60.0cm

Question 30:

• WAEC 2011

Presbyopia is a defect of the eye resulting from

A. Weak ciliary muscles
B. Short eyeball
C. Loss of sphericity of the lens
D. Long eyeball