The image of any real object formed by a diverging lens is always
Which of the following is not self-luminous?
An object is placed on the principal axis and at the centre of curvature of a concave mirror. The image of the object formed by the mirror is
A wire is stretched between two points, 1 m apart. If the speed of the wave generated on plucking the wire is 200 ms\(^{-1}\), what is the minimum frequency which will resonate with the wire?
Sixty complete waves pass a particular point in 4s. If the distance between three successive troughs of the waves is 15 m, calculate the speed of the waves.
