An object of height 5 cm is placed at 30 cm distance on the principal axis infront of a concave
mirror of focal length 20 cm. Find the image distance and size of the image.An object is placed
at the following distances from a convex lens of focal length 10 cm.
a) 8 cm. b) 15 cm. c) 20 cm. d) 25 cm.
Which position of the object will produce......
i) a diminished, real and inverted image ?
ii) a magnified, real and inverted image ?
iii) a magnified, virtual and erect image ?
iv) an image of same size as the object ?
Justify your answer in each case.
please say answer very fast......
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Answer:
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Height of object, h
o
=5cm, object distance u=−30cm, focal length f=−20cm
Now, from mirror formula :
f
1
=
v
1
+
u
1
v
1
=
f
1
−
u
1
=
20
−1
+
30
1
=−
60
1
v=−60cm - image distance
Magnification, m=−
u
v
=−
−30
−60
=−2
Size of image, h
i
=m(h
o
)=−2(5)=−10 cm
Video Explanation