Optical Instruments - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1989

The plane mirrors in a kaleidoscope are usually placed

A. At an angle of 60^o
B. Parallel to one another
C. Perpendicular to one another
D. At an angle of 45^o

Question 12:

• JAMB 1990

For a short sighted person, light rays from a point on a very distant object is focused

A. In front of the retina
B. On the retina by a converging lens
C. Behind the retina by a diverging lens
D. In front of the retina, a distance 2F from the lens

Question 13:

• JAMB 1992

Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

A. He cannot see distant objects clearly
B. Rays of light from a close object are focused in front of his retina
C. His eye ball is too long
D. Parallel rays of light are focused behind his retina

Question 14:

• JAMB 1993

The property of the eye known as its power of accommodation is controlled by the

A. Pupil
B. Virteous humour
C. Iris
D. Ciliary muscles

Question 15:

• JAMB 1999

An astronomical telescope is said to be in normal adjustment when the

A. Eye is accommodated
B. Focal length of objective lens is longer than that of eye piece
C. Final image is at the near point of eye
D. Final image is at infinity