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light -reflection & refraction

Asked by abhinavsinha 24th May 2010, 9:09 PM
Answered by Expert
Answer:

A paraxial ray is a ray which makes a small angle (θ) to the optical axis of the system, and lies close to the axis throughout the system.

The marginal ray in an optical system is the meridional ray that starts at the point where the object crosses the optical axis, and touches the edge of the  aperture top of the system

The visual angle is the angle a viewed object subtends at the eye, usually stated in degrees of arc. It also is called the object's angular size.

virtual object/Virtual image?convex mirror always forms a virtual image whenever object is not at infinity.

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Answered by Expert 24th May 2010, 10:50 PM
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