Question 461:

• JAMB 1987

An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed

A. 0.5cm
B. 1.5cm
C. 2.0cm
D. 6.0cm

Question 462:

• JAMB 1987

A pool of water appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.33, what is the actual depth of the pool?

A. 0.750m
B. 1.013m
C. 1.330m
D. 13.3000m

Question 463:

• JAMB 1987

A ray of light is incident at an angle of 30^o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray?

A. 60^o
B. 39^o
C. 28^o
D. 0^o

Question 464:

• 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

Question 465:

• JAMB 1987

If the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

A. N50^oE
B. N40^oE
C. N30^oE
D. N25^oE