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प्रश्न
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
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उत्तर
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.
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संबंधित प्रश्न
Give one use each of a concave and a convex mirror.
A ray of light is incident normally on a plane mirror. What will be the:
- angle of incidence?
- angle of reflection?
What kind of mirror is required for obtaining a virtual image of the same size as the object?
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
Name the kind of mirror used to obtain:
A virtual and diminished image
Upto what maximum distance from the pole the image in a convex mirror can be obtained? what will be the location of object then ?
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
Assertion: Incident ray is directed towards the centre of curvature of spherical mirror. After reflection it retraces its path.
Reason: Angle of incidence (i) = Angle of reflection (r) = 0°
