Optical Instruments - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1983

Which of the following statements about defects of vision is/are CORRECT? i. for a long sighted person, close objects appear blurred. ii. for a short sighted person, distant objects appear blurred. iii. short sight is corrected by using a pair of converging lenses.

A. I only
B. Ii only
C. I and ii only
D. Ii and iii only
E. I, ii and iii

Question 7:

• JAMB 1984

For correcting long sight defects in the human eye we require a

A. Converging lens
B. Diverging lens
C. Microscope
D. Periscope
E. Plain glass sheet

Question 8:

• JAMB 1984

Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length

A. I only
B. Ii only
C. Iii only
D. I and iii
E. Ii and iii

Question 9:

• JAMB 1985

Which of the following statements is NOT correct?

A. The average range of distinct vision for a normal eye is from the far distance (infinity) up to about 25cm in front of the eye
B. Longsighted people have difficulty in making the eye lense sufficiently powerful to focus on nearby objects
C. Shortsighted people cannot accommodate distant objects
D. Longsighted people need diverging spectacle lenses
E. A person with long sight has his eye-ball too short and the image of an object is therefore formed behind the retina

Question 10:

• JAMB 1987

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

A. -5mm
B. +5mm
C. -5cm
D. +5cm