Images that can't be captured on a screen are called

Convex lens is also called as

Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size, whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli respectively are

Which of the following always diverge light rays?

Q. Which of the following would you prefer to use while reading small letters found in a dictionary?

(a) A convex lens

(b) A convex mirror

(c) A concave lens

(d) Either (a) or (b)

A virtual image

(a) can be formed on the screen

(b) cannot be formed on the screen

(c) is formed only by a plane mirror

(d) is formed only by the convex mirror

What makes objects visible ?

If a positive terminal of one cell is connected to the negative terminal of the next cell it is known as

Which of these following cannot be harmed by electric current

When the switch is on the circuit from the positive to negative terminal is complete

Wires made from some special materials melt quickly and break when a large electric current passes through it.these wires are used to make

When an electric current flows through the wire it gets heated it is known as the heater

Electromagnets could be used in particular devices

Which of the following cannot be harmed by current

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A _________ is a safety device which prevents damages to electrical circuits and possible fires.

The amount of heat produced in a wire depends on

Who discovered the magnetic field of electric current?