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Common Rays in Thin Lenses

The focal len...

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The focal length of a convex lens is f an object is placed at a distance x from the first focal point .Find the ratio of the distance of the real image to that of the object from the pole .

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Complete the following sentences :

(a) An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ..........

(b) An object is placed at a distance 2f from a convex of lens of focal length f. The size of image formed is ............ that of the object.

(c) An object is placed at a distance 5 cm from a convex of focal length 10 cm. The image formed is virtual, upright and ............

Q. A point object

O

is placed at a distance of

20 c m

from a convex lens of focal length

10 c m

as shown in fig. At what distance

x

from the lens should a concave mirror of focal length

60 c m

, be placed so that the final image coincides with the object?

Q. An object S is placed at a distance of 20 cm from a convex lens of focal length 15 cm as shown in the figure. Where should a convex mirror of focal length 25 cm be placed from the lens, so that a real image is formed on the object itself?

Q. An object placed at a distance of

9 c m

from first principal focus of convex lens, produces a real image at a distance of

25 c m

from its second principal focus. Then focal length of lens is

Q. An object placed at a distance of 16 cm from first principal focus of convex lens, produces a real image at a distance of 36 cm from its second principal focus. Then the focal length of the lens is :

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Common Rays in Thin Lenses

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