Physics
(a) Is it possible for a concave lens to form an image of size two times that of the object? Write Yes or No.
(b) What will happen to the focal length of the lens if a part of the lens is covered with an opaque paper?
Refraction Lens
ICSE
15 Likes
Answer
(a) No.
(b) The focal length of the lens will not change.
Reason — The focal length of a lens is a characteristic property of the lens itself and is determined by its shape and refractive index. Covering a portion of the lens with opaque paper will not alter the lens's inherent optical properties.
Answered By
7 Likes
Related Questions
A metal foot ruler is held at the edge of a table. It is pressed at its free end and then released. It vibrates.
(a) Name the vibrations produced.
(b) State one way to increase the frequency of these vibrations.
'A geyser is rated 240 W – 220 V'. Explain the meaning of this statement.
A copper conductor is placed over two stretched copper wires whose ends are connected to a D.C. supply as shown in the diagram.
(a) What should be the magnetic poles at the points A and B lying on either side of the conductor to experience the force in the upward direction?
(b) Name the law used to find these polarities.
(a) Which electrical component protects the electric circuit in case of excess current and which can also be used as a switch?
(b) Name the wire to which this electrical component is connected in an electric circuit.