An object is placed 20cm from a concave mirror of focal l...
An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed
0.5
1.5
2.0
3.0
Correct answer is D
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{F}\)
\(\frac{1}{V} = \frac{1}{F} - \frac{1}{U}\)
\(\frac{1}{V} = \frac{1}{15} - \frac{1}{20}\)
\(\frac{1}{V} = \frac{\text{4 - 3}}{60}\)
\(\frac{1}{V} = \frac{1}{60}\)
V = 60cm
M = \(\frac{V}{U} = \frac{60}{20}\)
M = 3.0cm
Mica is used in electrical appliances such as electric iron because mica is ...
In copper plating, a current of 0.5A is allowed for cathode area of 100cm². If this current is ...
When temperature of a liquid increases, its surface tension ...
The design of the thermostat of an electric iron is based on the ...