Physics
Study the diagram below.
(i) Name the lens LL'.
(ii) What are the points O and O' called?
(iii) Complete the diagram to form the image of the object AB.
(iv) State three characteristics of the image.
Refraction Lens
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Answer
(i) LL' is a concave lens.
(ii) The points O and O' are called the second and first focal point.
(iii) Below is the completed diagram showing the image of the object AB:
(iv) The three characteristics of the image are virtual, erect and diminished.
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Complete the following table —
Type of lens Position of object Nature of image Size of image Convex Between the optical centre and focus Convex At focus Concave At infinity Concave At any distance Study the diagram given below.
(a) Name the lens LL'.
(b) What are the points O and O' called?
(c) Complete the diagram to form the image of the object AB.
(d) State the three characteristics of the image.
(e) Name a device in which this action of lens is used.
The following diagram in figure shows an object AB and a converging lens L with foci F1 and F2.
(a) Draw two rays from the object AB and complete the diagram to locate the position of the image CD. Also mark on the diagram the position of eye from where the image can be viewed.
(b) State three characteristics of the image in relation to the object.
The diagram given below in figure shows the position of an object OA in relation to a converging lens L whose foci are at F1 and F2.
(i) Draw two rays to locate the position of the image.
(ii) State the position of the image with reference to the lens.
(iii) Describe the three characteristics of the image.
(iv) Describe how the distance of the image from the lens and its size change as the object is moved towards F1.