14.3-Reflection of Light, Paper 2 (Section A)

Question 1

A beam of parallel light strikes a converging lens of focal length 2.8 cm
The width of beam before it reaches the lens is 2,0 cm. The width changes on the other side of the lens.
State a distance from the lens where the width of the beam is
i) less than 1.0 cm
ii) more than 1.0

Question 2

An object is placed 3.0cm from the converging lens of focal length of 2.8 cm. fig 6.1 is an incomplete, full scale ray diagram for this arrangement (14.3) pg1 (theory A)

i) On fig 6.1 draw the paths of the two rays after they pass through the lens
ii) Explain how your ray diagram shows that the image is more than 11 cm from the lens.
iii) Underline 3 of the following words which describe the image

Question 3

A person can focus clearly on objects that are far away, but near objects appear blurred
Fig 5.1 shows three rays from a point on a near object as they pass through the person’s eye
The refraction of the light as it enters the eye is ignored
ai) State the name of the eye defect shown in fig 5.1
ii) Explain what causes the image of the near object to appear blurred
b) A lens is used to correct the defect
i) On fig 5.2 draw a suitable lens placed in front of the eye and continue the path of the three rays to the back of the eye
ii) State what type of lens is used