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प्रश्न
The concave reflecting surface of a torch got rusted. What effect would this have on the beam of light from the torch?
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उत्तर
The beam of light from the torch will be diffused with lower intensity due to the rusted reflecting surface.
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संबंधित प्रश्न
Draw the following diagram in which a ray of light is incident on a concave/convex mirror on your answer sheet. Show the path of this ray, after reflection, in each case.
Study the following diagram and select the correct statement about the device 'X' :
(A) Device 'X' is a concave mirror of radius of curvature 12 cm
(B) Device 'X' is a concave mirror of focal length 6 cm
(C) Device 'X' is a concave mirror of focal length 12 cm
(D) Device 'X' is a convex of mirror of focal length 12 cm
If an object is placed at the focus of a concave mirror, where is the image formed?
Copy this figure in your answer book and show the direction of the light ray after reflection:
A concave mirror produces three times enlarged virtual image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.
If the object is moved further away from the mirror, what changes are there in the position and size of the image?
Why does a beam of light when it enters glass at an angle? Why does it not bend if it inters the glass at right angles?
For a real object, which of the following can produce a real image?
You are provided with a convex mirror, a concave mirror, a convex lens and a concave lens. You can get an inverted image from
A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distance with these mirrors as shown in the following table.
| Case No. | Object-distance | Focal length |
| I | 45 cm | 20 cm |
| II | 30 cm | 15 cm |
| III | 20 cm | 30 cm |
Now answer the following questions:
(a) List two properties of the image formed in Case I.
(b) In which one of the cases given in the table, the mirror will form real image of same size and why?
(c) Name the type of mirror used by dentists. Given reason why do they use such type of mirrors.
OR
(c) Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors? Draw a ray diagram to show the image formation in this case.
