A student wants to project the image of a candle flame on a screen 48 cm in front of a mirror by keeping the flame at a distance of 12 cm from its pole.
(a) Suggest the type of mirror he should use.
(b) Find the linear magnification of the image produced.
(c) How far is the image from its object?
(d) Draw ray diagram to show the image formation in this case.
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Answer:
it is suggested that he can use a convex mirror
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Concave Mirror
Explanation:
(a) The student should use a Concave Mirror, so that he can get a magnified image.
(b) Given distance of the object u = -12 cm
Distance of the image v = - 48 cm
Linear Magnification = - v/u = -(-48/-12) = -4 (Minus infers that the image is real and inverted)
(c) Focal length can be found using 1/f = 1/v + 1/u = -1/48 - 1/12 = -5/48
f = -48/5 = -9.6 cm
(d) Please see the attached picture for the ray diagram.
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