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) When the incident ray is parallel to the principal axis and falling on a convex mirror, then it gets diverged and appears to be coming from its focus $(F)$ after reflection from the mirror.
(b) When the incident ray is falling on a concave mirror while passing through its principal focus $(F)$, then it becomes parallel to the principal axis after reflection.
(c) When the incident ray is coming oblique to the principal axis and falling on the pole $(P)$ of a convex mirror then it gets reflected back making the same angle with the principal axis.
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- Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror and show the angle of incidence and angle of reflection on it.
- (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.
- Draw a labelled ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror. Mark the angle of incidence and angle of reflection on it.
- 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.
- What happens after refraction, when :(i) a ray of light parallel to the principal axis passes through a concave lens?(ii) a ray of light falls on a convex lens while passing through its principal focus?(iii) a ray of light passes through the optical centre of a convex lens?
- Fill in the following blank with a suitable word:A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from _______ after reflection from the mirror.
- (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.
- (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.
- Define the principal focus of a concave 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.
- (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.
- If an incident ray passes through the focus, the reflected ray will(a) pass through the pole (b) be parallel to the principal axis (c) retraces its path (d) pass through the centre of curvature
- Define principal axis of a spherical mirror.
- (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.
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