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An object of ...

Question

An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O', principal focus F and height of the image on the diagram.

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Solution

The required ray diagram is drawn as follows :

The image is formed at a distance 30 cm from the optical centre 'O', and the size of the image formed is 5 cm.

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An object of height 4.0 cm is placed at a distance of 30 cm from optical centre 'O' of a convex lens of focal length 20 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of image to the size of object.

Q. An object of height

2.5

cm is placed at a distance of

15

cm from the optical centre 'O' of a convex lens of focal length

10

cm. Draw a ray diagram to find the position and the size of the image formed. Mark optical center 'O', principal focus F and height of the image in the diagram.

Q. An object of height

4.0

cm is a placed at a distance of

30

cm from the optical centre 'O' of a convex lens of focal length

20

cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of the image to the size of the object.

Q. Draw a ray diagram to show the formation of image by a convex lens when an object is placed in front of the lens between its optical centre and principal focus.

Q. (a) Draw ray diagrams to show the formation of a three times magnified (i) real image (ii) virtual image, of an object kept in front of a converging lens. Mark the positions of object, F, 2F, O and position of image clearly in the diagram.
(b) An object of size 5 cm is kept at a distance of 25 cm from the optical centre of a converging lens of focal length 10 cm. Calculate the distance of the image from the lens and size of the image.

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