7.10.1 The Formation of Images by Plane Mirrors and Lenses (Structured Questions)


Question 1:
Diagram 1.1 and Diagram 1.2 show an experiment to measure the focal length of two convex lenses.


(a) Measure and write down the focal length in Diagram 1.1. [1 mark]

(b) Observe Diagram 1.1 and 1.2.
What is the difference between the focal lengths of the two convex lenses? [1 mark]


(c) State one inference for this experiment. [1 mark]

(d) State the variables in this experiment.
(i) Constant variable [1 mark]
(ii) Manipulated variable [1 mark]


Answer:
(a) 7.0 cm

(b)
The convex lens shown in Diagram 1.1 has a shorter focal length than the convex lens shown in Diagram 1.2.

(c)
The thicker a convex lens is, the shorter its focal length will be.

(d)(i)
Parallel light rays from a distant object passing through the convex lens.

(d)(ii)
Convex lenses with different thicknesses.


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