Q49 of 62 Page 106

An object is placed 10 cm away from a convex lens. The focal length of the lens is 40 cm, calculate the position and nature of the image.

Given


The distance of object from lens = -10cm (since the object is on the left-hand side of lens and acc. To our sign convention)


Focal length of convex lens = + 40cm (focal length of convex length is positive)


The distance of image from Lens = ?


Formula Used


Lens Formula



Magnification formula



Using lens formula



V = = -13.33cm


Hence, the image is on the same side of object at the distance of 13.33 cm from lens and the image is virtual.


Using magnification formula



M = 1.33


The image is 1.33 times the object and is erect.


More from this chapter

All 62 →
47

An image of an object placed in front of a convex mirror formed 8 cm away. If the focal length of the mirror is 16 cm, calculate the distance of the object from the mirror.

 48

An object is placed 60 cm away from a convex lens of focal length 30 cm. If the height of the object is 3 cm then calculate the position and nature of the image.

 50

The focal length of a concave mirror is 30 cm, if an object is placed at a distance of 20 cm, calculate the position and nature of the image.

 51

The image of an object placed in front of a concave lens is formed at 10 cm. If the focal length of lens is 15cm then calculate distance of object from lens.