4）．In Michelson interferometer experiment, the reading wheel can only rotate in one direction in the measurement process

[answerhappygod]

4）．In Michelson interferometer experiment, the reading wheel can
only rotate in one
direction in the measurement process in order to
avoid________________, not
reverse.（5）．The main components of the oscilloscope tube
include________ 、________and____________. （6）．The young's modulus
of elasticity of steel is measured with the optical lever.
The measured optical lever constant (the vertical distance between
the two
toes of the mirror) B is 7.00cm, and the horizontal distance from
the ruler to the plane mirror d is 105.0cm. At this time, the
magnification of the optical
lever is_______________.