物理透鏡 DSE、CE 選擇題（第 4 頁）

31.

If $F$ , $F'$ are foci and $C$ , $C'$ are both at a distance of two times the focal length from the lens, which of the following ray diagrams is/are correct ?

Three ray diagrams (1), (2), (3) for a concave lens

32.

A convex lens is used as a magnifying glass to read small printing in a book. Which of the following statements is/are true ?

(1)The image distance is greater than the object distance.

(2)The image of the printing is real.

(3)The image of the printing is erect.

33.

Object in front of a convex lens with four rays P, Q, R and S emerging

Which of the 4 light rays $P$ , $Q$ , $R$ and $S$ drawn above is NOT possible ?

34.

If $C$ , $C'$ are both at a distance of $2$ times the focal length from a convex lens, which of the following ray diagrams is correct ?

Four ray diagrams A to D for a convex lens with C and C'

35.

Object O, image I and points P, Q, R, S on the axis of a concave lens

The figure shows an object $O$ placed in front of a concave lens to give an image $I$ . What is the most probable position of the focus ?

36.

Convex lens L with points D', C', F' on the left and F, C, D on the right

An object is placed in front of a convex lens $L$ in the region $D'C'$ , as shown in the diagram. If $F$ is the focus of the lens, where should the image lie ?

37.

A concave lens is placed above the letter "d" which has the size shown in the above figure. The image of the letter "d" appears as

Four letters A to D: a smaller d, a smaller p, a larger d, a larger p

38.

Which of the following ray diagrams is/are correct ?

Three ray diagrams (1), (2), (3) for a convex lens with F and F' marked

39.

Object O and inverted real image I on opposite sides, with points A, B, C and D on the axis

In the diagram shown, the image $I$ is produced by a lens. The object is placed at $O$ . What is the nature and position of this lens ?

40.

Which of the following ray diagrams correctly show(s) the paths of light rays through the lens ?

Three ray diagrams (1), (2), (3) for a convex lens with F and 2F marked