A concave mirror is used for image formation.What inferences can be drawn about the following when an object is placed at a distance of 10 cm from the pole of a concave mirror of focal length 15 cm?
(a) Position of the image
(b) Size of the image
(c) Nature of the image
Draw a labelled ray diagram to justify your inferences.
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10
Answer:
(a) 30cm
(b) Highly enlarged
(c) Virtual & erect
Explanation:
u = -10 cm
f = - 15 cm
By mirror formula
1/f = 1/v + 1/u
1/f - 1/u = 1/v
1/-15 + 1/10 = 1/v
-2 + 3/30 = 1/v
1/30 = 1/v
(a) V = + 30 cm
(b) Highly magnified
m = -v/u
m = -30/-15
m = 2
(c) Virtual & erect image.
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Answered by
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Answer:
a .position of the mirror
given object distance ( u) =_10cm
focal length (f)= _15cm
by using mirror formula
1/v+1/u=1/f
from the formula
1/v =1/ f_1/u
1/v=1/_15_1/_10
1/v=2/_30_3/_30
1/v=30
v=30
b.size of the image
highly enlarged
c.nature of the image
virtual, erect, real and inverted
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