In a compound microscope, what does the objective hand to the eyepiece?

• A real, enlarged, inverted image
• Parallel rays straight from the object
• A virtual image already at the near point

You hold a convex lens close over a small shell, inside its focal length. What do you see?

• An upside-down, smaller image
• An upright, enlarged image
• A sharp image cast on the table

A telescope aperture is doubled. Which two gains follow?

• A wider field of view and an upright image
• A longer tube and a shorter eyepiece
• More light gathered and finer detail resolved

Two telescopes share a 2 cm eyepiece. One has a 40 cm objective, the other an 80 cm objective. Which magnifies more?

• Both the same, since only the eyepiece magnifies
• The 80 cm one, since magnification goes as objective over eyepiece
• The 40 cm one, since a shorter objective bends light more

An eyepiece of focal length 5 cm is used with the final image at infinity. The lesson rule divides 25 by the focal length. Type the eyepiece angular magnification.

Answer: ______________

Why does a telescope show a smaller patch of sky than your bare eye?

• The objective blocks most of the incoming light
• The eyepiece flips the image upside down
• Magnification spreads a small patch over your view, trading field for detail

A calculation gives a microscope magnification of minus 186. What does the minus sign tell you?

• The final image is inverted
• The image is 186 times smaller
• The objective is faulty

A microscope with a 10x objective and a 5x eyepiece magnifies 15x.

Circle one:   True   False