Optical Instruments - Jamb Physics Past Questions and Answers

Question 31:

• JAMB 2012

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

Question 32:

• JAMB 2012

What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?

A. Compound microscope
B. Galileo's telescope
C. Terrestrial telescope
D. Astronomical telescope

Question 33:

• JAMB 2012

The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for

A. Improving the sharpness
B. Creating an inverted image
C. Magnification of the image
D. Erection of the image

Question 34:

• JAMB 2013

If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope

A. 2
B. 3
C. 11
D. 28

Question 35:

• JAMB 2014

In a compound microscope, the objective and the eye piece focal lengths are

A. At infinity
B. Long
C. Short
D. The same