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प्रश्न
A ray of light is incident normally on a plane mirror. What will be the
angle of reflection?
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उत्तर
The angle of reflection is 0o in accordance with the first law of reflection, which states that the angle of incidence is equal to the angle of reflection.
संबंधित प्रश्न
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
Why is a hole burnt in the carbon paper?
Name the spherical mirror which can produce a virtual and diminished image of an object.
- A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- Calculate the distance of the image from the lens by using the lens formula.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- 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).
Explain the following terms :
Pole, Centre of curvature, Radius of curvature, Principal axis. Show them on separate diagrams for each of the concave and convex mirrors.
Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.
Complete the following diagrams in Figure by drawing the reflected rays for the incident rays 1 and 2.
For what position of object, the image formed by a concave mirror is magnified and erect?
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
The erect image formed by a concave mirror is of size double the size of object. How are u and v related?
An object is placed at 4 cm distance in front of a concave mirror of radius of curvature 24 cm. Find the position of image. Is the image magnified?
Define the following term in relation to concave mirror.
Pole
What do you understand by the term real image?
An object 10 cm high is placed at a distance of 20 cm in front of a spherical mirror of focal length 25 cm. By scale drawing find the nature, position, and magnification of the image in the following case:
Convex mirror
The following Figure shows a concave mirror MM' on which a ray of light incident from a point P gets reflected to meet the principle axis at O.
(a) Find, by construction, the position of the centre of curvature of the concave mirror.
(b) Write down the value for the radius of curvature of the mirror.
(c) Calculate the focal length of the mirror.
(d ) Which relation is used in deducing the focal length from the radius of curvature?
Complete the following diagrams shown in the following figures by drawing the reflected rays.
A ray of light is incident towards a plane mirror at an angle of 30° with the mirror surface. What will be the angle of reflection?
