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A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
Complete the following diagrams shown in Fig. by drawing the reflected ray for each of the incident ray A and B.
Draw a ray diagram to show the formation of image by a concave mirror for the object beyond its centre of curvature. State three characteristics of the image.
Name the mirror which always produces an erect and virtual image. How is the size of image related to the size of object?
Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
State the kind of mirror used
(a) By a dentist,
(b) As a search-light reflector.
The image formed by a convex mirror is
A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of 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.
Which of the following has curved reflecting surface?
