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

Question 41:

• JAMB 1992

A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

A. 12cm
B. 24cm
C. 48cm
D. 108cm

Question 42:

• JAMB 1993

Which of the following expressions gives the linear magnification produced by a concave mirror of radius of curvature r, if U and V are the object and image distances respectively?

A. \(\frac{V}{r}\) - 1
B. \(\frac{2V}{r}\) - 1
C. \(\frac{U}{r}\) - 1
D. \(\frac{2U}{r}\) - 1

Question 43:

• JAMB 1993

If the focal length of a camera lens is 20cm, the distance from the film at which the lens must be set to produce a sharp image of an object 100cm away is

A. 17cm
B. 20cm
C. 25cm
D. 100cm

Question 44:

• JAMB 1993

Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2

A. \( 30^{\circ} \)
B. \( 45^{\circ} \)
C. \( 60^{\circ} \)
D. \( 90^{\circ} \)

Question 45:

• JAMB 1994

To produce a parallel beam of light from a concave mirror, the distance at a which the lamp should be placed from the mirror is equal to

A. The focal length
B. Two times the focal length
C. The distance of the image
D. Two times the radius of curvature