Define (i) Principal Axis (ii) Focal length. State the type of mirror used in (i) reflector of torch
(ii) rear view mirror of cars (iii) shaving mirror
Answers
Answer:
principal axis
An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope. The optical axis is an imaginary line that defines the path along which light propagates through the system, up to first approximation.
focal length
the distance between the centre of a lens or curved mirror and its focus.
the equivalent distance in a compound lens or telescope.
reflector of torch
The role of the reflector is to gather the light emitted by the source and focus it out thus creating a strong beam of light.
rear view mirror
a small angled mirror fixed inside the windscreen of a motor vehicle enabling the driver to see the vehicle or road behind.
shaving mirror
A shaving mirror is a small, often round, mirror that can be moved out from a wall, and which you use to see your reflection when you are shaving your face.
Explanation:
hope it helps you
Answer:
rear view mirror of cars