The distance between the extreme points on the periphery of the mirror is called:

focal length

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radius of curvature

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principal section

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none of these

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Solution

The correct option is C principal section
Principal section is also defined as the normal 'side view' of the mirror for a ray diagram. In the diagram AB is the principal section.

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Fill in the following blanks with suitable words :

(a) Parallel rays of light are reflected by a concave mirror to a point called the ___.

(b) The focal length of a concave mirror is the distance from the ___ to the mirror.

(d) For a convex mirror, parallel rays of light appear to diverge from a point called the___.

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