Physics
(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?
(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.
Related Questions
Two copper wires A and B are of the same thickness and are at the room temperature. If the length of A is twice the length of B then :
(a) Compare their resistances
(b) Compare their resistivity
(a) Name the waves used for echo depth sounding.
(b) Give one reason for their use in the above application
It is observed that the house circuits are arranged in a parallel combination. Give two advantages of this arrangement.
A transformer is used to change a high alternating e.m.f. to a low alternating e.m.f. of the same frequency.
(a) Identify the type of transformer used for the above purpose.
(b) State whether the turns ratio of the above transformer is = 1 or >1 or <1.