Summative Practice – Form 5 Science (KSSM) Chapter 7


Question 1:
Draw ray diagrams which describe the following characteristics of lenses:
(a) convex lens as a converging lens

(b) concave lens as a diverging lens



Answer:
(a)



(b)




Question 2:
Figure 1 shows an object placed in front of a convex lens at a distance less than the focal length, ƒ.

(a) Draw a ray diagram in Figure 1 to determine the image formed by the convex lens.

(b) State the characteristics of the image formed by the convex lens in Figure 1.


Answer:
(a)

(b) Virtual, upright, magnified


Question 3:
(a) Why do smartphones have several cameras?

(b) A student carried out an experiment to form a virtual image using a convex lens. Explain how the student formed the virtual image based on the apparatus set-up in Figure 2.
Figure 2

(i) Write the problem statement.

(ii) State the position of the object (at P, Q or R).

(iii) Using an arrow (↑) as the object, draw a ray diagram to show the formation and position of the image. Complete Figure 2 to obtain your answer.

(iv) State two other characteristics of the image formed in 3(b)(iii).


Answer:
(a) To produce images of different sizes using camera lenses of different focal lengths

(b)(i) Where is the position of the object so that a virtual image is formed?

(b)(ii) R

(b)(iii)

(b)(iv)
Upright, magnified

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