Reflection of Light at Plane and Curved Surfaces - Jamb Physics Past Questions and Answers

Question 46:

• JAMB 1994

An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?

A. 5cm
B. 10cm
C. 30cm
D. 40cm

Question 47:

• JAMB 1994

In a projection lantern of focal length f, the object distance u, is such that

A. U > 2f > f
B. U < f < 2f
C. U = f < 2f
D. F < u < 2f

Question 48:

• JAMB 1995

A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is

A. Convex and u =2f
B. Concave and u = 2f
C. Convex and u = f
D. Concave and u = f

Question 49:

• JAMB 1997

A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a

A. Convex mirror with his face at the focus
B. Concave mirror with his face between the focus and the mirror
C. Concave mirror with his face at the focus
D. Convex mirror with his face between the focus and the mirror

Question 50:

• JAMB 1998

An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be

A. Virtual and diminished
B. Magnified and erect
C. Real and inverted
D. Diminished and erect