Which one of the following statements is not correct?
The radius of curvature of a concave mirror is twice its focal length
Power of a convex lens is negative and that of a concave lens is positive
The radius of curvature of a plane mirror is infinity
When a ray of light passes from an optically denser medium into an optically rarer medium, the angle of refraction is greater than the corresponding angle of incidence
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