Question

Physics

Q1. Draw a ray diagram of concave and convex mirror separately and represent all the terms (pole, focus, centre of curvature, radius of curvature, aperture, principal axis and focal length).
Q2. Draw table 10.1 given on pg 164 and learn it.
Q3. Draw the ray diagrams with reflected ray in the following cases for *concave mirror* :
1. When incident ray is coming parallel to the principal axis.
2. When incident ray is passing through centre of curvature.
3. When incident ray is passing through the focus.
4. When incident ray is directly striking to the pole.
Q4. Draw the same (4) ray diagrams with reflected ray as given in above question for *convex mirror*.​

Answer 1

Answer:

(a) Centre of curvature: Centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part.

(b) Radius of curvature: Radius of curvature of a spherical mirror is the radius of the hollow sphere of glass of which the mirror is a part.

(c) Pole: The centre of a spherical mirror is called its pole.

(d) Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis.

(e) Aperture: The portion of a mirror from which the reflection of light actually takes place is called the aperture of the mirror.

Answer 2

All life (living) would die, if all the water from the earth, disappeared. ... Water is a large component of all living cells, animals, plants etc and thus they would all be completely destroyed. The sky without its water content and with a high oxygen content may even change colour with a reddish tint