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 ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from focus after reflection from the mirror.
Explanation
According to the first rule of image formation, the ray of light parallel to the principal axis appears to be coming from the focus $F$ after reflection.
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- 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.
- How is the reflection of light ray from a plane mirror different from the refraction of light ray as it enters a block of glass?
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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.
- A ray of light strikes a plane mirror at an angle of 40° to the mirror surface. What will be the angle of reflection?
- 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?
- 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 ray of light falls on a plane mirror forming an angle of 20 degree with the mirror. The deviation of the ray​ on reflection is?
- Fill in the following blank with a suitable word:When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ___________ of the material.
- Which of the following can make a parallel beam of light when light from a bulb falls on it?(a) concave mirror as well as concave lens (b) convex mirror as well as convex lens(c) concave mirror as well as convex lens (d) convex mirror as well as concave lens
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