The speed

of stationary waves is always

A standing

wave is observed in a string. The distance between the nodes is 0.5 m. The

wavelength is therefore:

A convex lens produces an image 6 cm away by an object 18 cm

away. What is the focal length of the lens?

With a 4 cm high object, positioned 12 cm away from a 4 cm

focal length concave mirror, what is the height of the image?

An image is created by a 2 cm focal length concave mirror.

The image is located 3 cm from the mirror. How far from the mirror is the

object?

A 3.0 cm high object 5 cm from a convex mirror produces a virtual

image. If the mirror has a focal length of 5 cm, what is height of the image?

If a lens creates a real image, which of the following CANNOT be true?

Lens which is thin at the centre and thick at the edges is

A converging lens refracts rays of light parallel to the principal axis, converging on a point. This point is called

Lens which diverges light from a single point are