Last Updated On [03-11-2023]
The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image
a)
1.25 cm
b)
2.5 cm
c)
1.05 cm
d)
2 cm
The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image
a)
1.25 cm
b)
2.5 cm
c)
1.05 cm
d)
2 cm
Question ID - 152672 :-
The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image
a)
1.25 cm
b)
2.5 cm
c)
1.05 cm
d)
2 cm
|
The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image |
|||||||
|
a) |
1.25 cm |
b) |
2.5 cm |
c) |
1.05 cm |
d) |
2 cm |
(b)
Image formed by convex lens at 
will act as a virtual object for concave lens. For concave lens
.png)
Or 
cm
Magnification for concave lens
As size of the image at 
is 2 cm. Therefore, size of image at 
will be 
cm.
Next Question :
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Astigmatism (for a human eye) can be removed by using |
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|
a) |
Concave lens |
b) |
Convex lens |
c) |
Cylindrical lens |
d) |
Prismatic lens |
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