(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.
(a) Definitions-
(i) Principal focus $(F)$ of a convex mirror: It is a point on its principal axis from which a beam of light rays, initially parallel to the principal axis, appears to diverge after being reflected from the convex mirror.
(ii) Focal length $(f)$ of a convex mirror: It is the distance from the pole $(P)$ to its principal focus $(F)$.
(b) Ray Diagram-
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- Describe with a suitable diagram, how a convex mirror perges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of convex mirror in this diagram.
- (a) Draw a diagram to represent a convex mirror. On this diagram mark principal axis, principal focus $F$ and the centre of curvature $C$ if the focal length of convex mirror is 3 cm.(b) An object 1 cm tall is placed 30 cm in front of a convex mirror of focal length 20 cm. Find the size and position of the image formed by the convex mirror.
- Draw ray diagram to show the principal focus of a:(i) concave mirror(ii) convex mirror
- (a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.(b) State whether convex lens has a real focus or a virtual focus.(c) List some things that convex lens and concave mirror have in common.
- 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.
- A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
- 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.
- (a) Draw a labelled ray diagram to show the formation of image of an object by a convex mirror. Mark clearly the pole, focus and centre of curvature on the diagram.(b) What happens to the image when the object is moved away from the mirror gradually?(c) State three characteristics of the image formed by a convex mirror.
- According to New Cartesian Sign Convention:(a) focal length of concave mirror is positive and that of convex mirror is negative(b) focal length of both concave and convex mirrors is positive(c) focal length of both concave and convex mirrors is negative(d) focal length of concave mirror is negative and that of convex mirror is positive
- (a) Explain with the help of a diagram, why the convex lens is also called a converging lens.(b) Define principal axis, principal focus and focal length of a convex lens.
- What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror)? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
- Determination of Focal Length of Concave Mirror and Convex Lens
- If the focal length of a convex mirror is 25 cm, what is its radius of curvature?
- Out of convex mirror and concave mirror, whose focus is situated behind the mirror?
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