A four times image of vandal is formed at a distance of 9cm from the candal on a screen by a spherical mirror. Calculate object and image distance
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10th
Physics
Natural Phenomena
Images Formed by Spherical Mirrors
A student wants to project ...
PHYSICS
A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 cm from its pole.
i) Which type of mirror should the student use?
ii) Find the magnification of the image produced.
iii) Find the distance between the object and its image.
iv) Draw a ray diagram to show the image formation in this case and mark the distance between the object and its image.
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
solution