Post Utme Physics Past Questions and Answers

Question 686:

The magnification of the image of an object placed in front of a convex mirror is 1/3, if the radius of curvature of the mirror is 24cm, what is the distance between the object and its image?

A. 8cm
B. 16cm
C. 24cm
D. 32cm

Question 687:

The plane mirrors is a kaleidoscope are usually placed

A. At an angle of 600
B. Parallel to one another
C. Perpendicular to one another
D. At an angle of 450

Question 688:

A far sighted person cannot see objects that are less that 100cm away. If this person wants to read a book at 25cm, what types and focal length of lens does he need?

A. Convex, 20cm
B. Concave, 20cm
C. Convex, 33cm
D. Concave, 33cm

Question 689:

When a yellows card is observed through a blue glass, the card would appear

A. Black
B. Green
C. Red
D. White

Question 690:

Dispersion of light by a glass prism is due to the ____________

A. Different hidden colours of the glass
B. Different speeds of the various colours in glass
C. Defects in the glass
D. High density of glass