Advertisements
Advertisements
Question
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Solution
Focus of a concave mirror: The focus of a concave mirror is a point on the principal axis through which the light rays incident parallel to principal axis, pass after reflection from the mirror.
Focal length of a concave mirror: The distance of the focus from the pole of the concave mirror is called its focal length.
APPEARS IN
RELATED QUESTIONS
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
State the position of object for which the image formed by a concave mirror is of same size.
A concave mirror forms a virtual image of size twice that of the object placed at a distance 5 cm from it.
Find : (a) the focal length of the mirror (b) position of image
Define the following term in relation to concave mirror.
Principal axis
Is real image always inverted?
Name the two types of spherical mirrors.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
