1. An object of height of 17cm is kept at a
distance of 20 cm
in front of o mirror
The focal length of the mirror is 15 cm.
At What
distance from the mirror
should screen be kept so as to get
will be size and nature
clear images? What will be size and nature
of the image?
Answers
Answered by
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Answer:
Size of object h
o
=7cm
Size of the object h
o
=?
Focal length f=−15cm
Object distance u=−25cm
Image distance v=?
Using mirror formula,
f
1
=
v
1
+
u
1
−15
1
=
v
1
+
−25
1
v
1
=
75
−5+3
v=−37.5cm
Hence, position of image at 37.5cm infront of the mirror.
Magnification(M)=
h
o
h
i
=
u
−v
=
−25
37.5
=−1.5
h
i
=−1.5×h
O
h
i
=−1.5×7=−10.5cm
Hence,size of image is −10.5cm.
Nature of image is real,inverted and magnified.
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