Page 244 - Physics_Form_2
P. 244
Physics for Secondary Schools
do not. This is because the image is lens and f is the focal length
e
formed in front of the retina. of the eyepiece lens. For greater
7. Hyperopia is a condition in which magnification, f should be ____.
o
images of nearby objects are blurry, (a) much larger than f
whereby the image is formed behind (b) equal to f e
e
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the retina. (c) slightly smaller than f
8. Presbyopia is the gradual loss of (d) much smaller than f e e
the eye’s ability to focus on nearby
objects, and it occurs because of old (iii) Which of the following
age. statements is not the reason
9. Astigmatism is the imperfection in why a microscope has an
the curvature of the eye that causes objective lens of short focal
the formation of blurred images. It length?
occurs when either the cornea or the (a) It allows more light to be
lens has mismatched curves. collected.
(b) It keeps the distance
between the objective
Revision Exercise 6 lens and the eyepiece
lens small.
1. Choose the correct answer from the (c) It gives the microscope
given alternatives. more magnifying power.
(i) The part of the human eye that (d) It makes the image
corresponds to the film in a formed to be inverted.
camera is the ________.
(a) iris (c) retina (iv) Which of the following
(b) pupil (d) cornea combinations of lenses can
(ii) In the astronomical telescope, f be used on a compound
o
is the focal length of the objective
microscope?
Objective lens Eyepiece lens
(a) Long-focus converging lens Short-focus converging lens
(b) Long-focus converging lens Short-focus diverging lens
(c) Long-focus converging lens Long-focus converging lens
(d) Short-focus converging lens Long-focus converging
2. (a) A student sitting at the back of the classroom cannot read the letters written
on the blackboard clearly. What advice will a doctor give him? Draw a ray
diagram for the correction of this defect
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Student’s Book Form Two
Physics Form 2 Final.indd 238 25/10/2025 10:28
