A student wants to project the image of a candle flame on a screen 80cm in front of a mirror by keeping the candle flame at a distance of 20cm from its pole..
a. Which type of mirror should he use?
b.Find the magnification of the image.
c.Find the distance between object and image.
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Answer:
ANSWER
v
1
+
u
1
=
f
1
⇒
−80
1
+
−20
1
=
f
1
⇒ f=
−(20+80)
20×80
=
100
−1600
=−16 cm
i) Since , f is negative , the mirror is concave mirror
ii) Magnification =
u
−v
=
−20
−(−80)
=
4
ii) From fig distance between object and image is
60 cm
iv) Draw above
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