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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?
What type of image is formed:
on a cinema screen?
What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
Name the kind of mirror used to obtain :
A real and enlarged image
The focal length of a concave mirror is 10 cm. Find its radius of curvature.
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
