Page 168 - Physics_Form_2
P. 168
Physics for Secondary Schools
(b) Which mirror can serve the following cases. A ray of light
conveniently as a make-up incident on the convex mirror.
mirror? Illustrate this function (a) Passing through its optical
with a ray diagram. centre
(b) Is directed towards its principal
3. A spherical mirror creates an image focus
with a magnification of -1 on a (c) Parallel to its principal axis
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screen positioned 50 cm away from 7. Suppose you have three concave
the mirror. mirrors, A, B, and C, of focal lengths
(a) Identify the type of mirror used. 10 cm, 15 cm, and 20 cm. For each
(b) Calculate the distance from the concave mirror, you experiment with
image to the object. image formation for three values of
(c) Determine the focal length of object distances: 10 cm, 20 cm, and
the mirror. 30 cm. Provide reasons for each of
(d) Illustrate the ray diagram to the following:
demonstrate how the image is (a) For the three object distances,
formed in this scenario. identify which mirror produces
4. A student wants to project the image an image with a magnification
of the candle flame on a screen of -1.
80 cm in front of a mirror while (b) Out of the three mirrors, identify
keeping it 20 cm from its pole. which one you would prefer to
(a) Which type of mirror should the use for saving purposes or for
student use? applying makeup.
(b) Determine the magnification of (c) For mirror B, create a ray
the image produced. diagram to illustrate image
(c) Determine the distance between formation for object distances
the object and its image of 10 cm and 20 cm.
(d) Draw the ray diagram to show 8. A student has focused the image of
the image formation in this case a candle flame onto a white screen
and mark the distance between using a concave mirror. The situation
the object and its image. is given:
5. Draw a ray diagram to show the Length of the flame = 1.5 cm
path of the reflected ray in each of Focal length of the mirror = 12 cm
the following cases. A ray of light
incident on the convex mirror. Distance of flame from the mirror
(a) Strikes at its pole, making an = 18 cm
angle θ from the principal axis. If the flame is perpendicular to the
(b) Is directed towards its principal principal axis of the mirror, then
focus calculate the following:
(c) Parallel to its principal axis (a) Distance of the image from the
6. Draw a ray diagram to show the mirror
path of the reflected ray in each of (b) Length of the image
162
Student’s Book Form Two
Physics Form 2 Final.indd 162 25/10/2025 10:27
