Use of the mirror formula - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1988

An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed?

A. 30cm and virtual
B. 6cm and real
C. 6cm and virtual
D. 30cm and real

Question 7:

• JAMB 1989

The magnification of the image of an object placed in front of a convex mirror is \(\frac{1}{3}\). If the radius of curvature of the mirror is 24cm, what is the distance between its object and its image?

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

Question 8:

• JAMB 1989

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

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

Question 9:

• JAMB 1990

An object which is 3cm high is placed vertically 10cm in front of a concave mirror. If this object produces an image 40cm from the mirror, the height of the image is

A. 0.75cm
B. 4.00cm
C. 8.00cm
D. 12.00cm

Question 10:

• JAMB 1990

What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

A. 20cm
B. 15cm
C. 10cm
D. 5cm