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प्रश्न
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).
उत्तर
(i) When an object is placed between the optical center and principal focus of a convex lens
Since the image formed is virtual and erect so sign of magnification will be positive. Moreover, the image formed is magnified therefore the absolute value of magnification will be greater than one.
(ii) When an object is placed anywhere in front of a concave lens.
Since the image formed is virtual and erect so sign of magnification will be positive. Moreover, the image formed is diminished therefore the absolute value of magnification will be less than one.
(iii) When an object is placed at 2F of a convex lens.
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संबंधित प्रश्न
Explain the following term related to spherical lenses:- centres of curvature
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
Name the kind of mirror used to obtain:
A virtual and diminished image
An object forms a virtual image which is 1/8th of the size of the object. If the object is placed at a distance of 40 cm from the convex mirror, calculate:
- the position of the image
- the focal length of the convex mirror.
The boxes in figure (a, b, c) represent mirrors; insert a mirror which will reflect the incident ray as shown in the diagram.
Complete the following diagrams shown in the following figures by drawing the reflected rays.
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?
