Phys 4, Section 2                                                                         Apr 18, 2002

1. Which type of mirror can sometimes produce a real image of a real axial object?
    A) plane         B) convex         C) concave

2. Where must a real axial object be located relative to a positive thin lens to
    produce an enlarged real image?
    A) between ∞ and 2f         B) between 2f and f         C) between f and V
    D) can’t be done

3. Where must a real axial object be located relative to a negative thin lens to
    produce an enlarged real image?
    A) between ∞ and 2f         B) between 2f and f         C) between f and V
    D) can’t be done

4. To get the desired result from a magnifier, where must a real axial object be
    placed?
    A) between ∞ and 2f         B) between 2f and f         C) between f and V
    D) can’t be done

5. Which type of telescope produces an erect image?
    A) astronomical         B) terrestrial         C) both         D) neither

6. A plano-concave lens is
    A) converging         B) diverging         C) neither         D) both

7. What is the basic length of a refracting astronomical telescope?
    A) f_e/f_o         B) f_o/f_e         C) f_o + f_e         D) f_o – f_e

8. Which instrument wants f_o to be short?
A) microscope         B) telescope         C) neither         D) both

9. A lens-maker wants to use 1/f = (n - 1) (1/R₁ – 1/R₂) to make a double convex
    lens of positive focal length. Which R has a negative value?
    A) R₁         B) R₂         C) both         D) neither

10. What kind of mirror is never used as the external passenger side mirror?
     A) concave         B) convex         C) plane

Answers: 1-c, 2-b, 3-d, 4-c, 5-b, 6-b, 7-c, 8-a, 9-b, 10-a

Last modified on April 25, 2002