According to the New Cartesian Sign Convention, which one of the following is correct in respect of the formula 1/f = 1/v + 1/u, where symbols have their usual meanings?
It applies only to spherical mirrors.
It applies only to spherical lenses.
It applies to spherical mirrors as well as spherical lenses.
It is an invalid formula.
For election to the Lok Sabha, a nomination paper can be filed by
Miscellaneous · Easy
In a month if the seventh day is three days earlier than Saturday,then the nineteenth day of the month will be a
Miscellaneous · Easy
Which among the following events happened earliest ?
Miscellaneous · Easy
An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
Miscellaneous · Easy