A physics student places an object 6.0 cm from a converging lens of focal length 9.0 cm.
What is the magnitude of the magnification of the image produced?
3.0.
2.0.
18.
0.6.
A diffraction grating has 500 lines per millimetre and is illuminated normally by monochromatic light of wavelength 600 nm.
The total number of images seen on both sides of the normal including the central image is:
5.
7.
8.
10.
