Question

5. Define the following (Concave mirror):
a) Principal axis b) Focus​

Answer 1

Answer:

a) Line passing through the pole (P) and centre of curvature (C) of the spherical mirror is called principal axis.

b) A point on the principal axis where a beam of light is parallel to the principal axis after reflection will converge is known as Principal Focus (F).

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Answer 2

1. CONCAVE MIRROR :A curved mirror is a mirror with a curved reflecting surface . The surfaces may be either convex or concave .
2. PRINCIPAL AXIS:Each of three mutually perpendicular axes in the body about which the moment of inertia is at the maximum.
3. FOCUS: one of the fixed point which the distance of any point of the given curve connected by the linear realtion .

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