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A paraxial ray is one which makes a small angle to the optical axis of the system.

Q: How would you define paraxial ray?
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A paraxial ray is one which makes a small angle to the optical axis of the system.

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A convex mirror bulges out. A concave mirror curves inward.

For a convex mirror, light rays are reflected to meet at a point, while, for a concave mirror, light rays seem to be reflected from a point. If the incident rays were paraxial, the reflected rays are reflected to meet at, or appear to be reflected to a point referred to as the focal point of the lens. For a convex mirror, the focal point is real, while, that of a concave lens is virtual.

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Gamma rays

X-rays

Ultra violet rays ( purple)

Visible Light rays

Micro rays

Infra red rays

Radio rays

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Gamma rays.

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marginal rays are those rays which are near the rim of lens and axial rays are those rays which are formed near the axis

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