Define the principal focus of a concave mirror.
Whenever light rays from a source are parallel to the principal axis of a concave mirror, they all converge at a single point after reflection.
This point will be on the principal axis of the concave mirror and it is called 'Principal focus'.
The principal focus is denoted by the letter F
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- (a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.(b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.
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- Define principal axis of a spherical mirror.
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- Define the following terms with respect to spherical mirrors: (i) Pole (ii) Centre of curvature (iii) Principal axis (iv) Principal focus
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- (a) What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?(b) Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the convex mirror.
- Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
- List four properties of the image formed by a concave mirror when an object is placed between the focus and pole of the mirror.
- Draw a ray diagram in each of the following cases to show what happens after reflection to the incident ray when (a) it is parallel to the principal axis and falling on a convex mirror.(b) it is falling on a concave mirror while passing through its principal focus.(c) it is coming oblique to the principal axis and falling on the pole of a convex mirror.
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