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प्रश्न
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
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उत्तर
Concave Mirror: This is because for solar furnaces, we use a concave mirror. Light from the sun, on reflection from the mirror, is concentrated at the focus of the mirror, producing heat.
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संबंधित प्रश्न
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen (S) as shown below in the diagram. Select the correct statement about the device (X).
A 4 cm tall object is placed on the principal axis of a convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again? How will the magnification of the image be affected?
Match the items given in Column I with one or more items of Column II.
| Column I | Column II | ||
| (a) | A plane mirror | (i) | Used as a magnifying glass. |
| (b) | A convex mirror | (ii) | Can form image of objects spread over a large area. |
| (c) | A convex lens | (iii) | Used by dentists to see enlarged image of teeth. |
| (d) | A concave mirror | (iv) | The image is always inverted and magnified. |
| (e) | A concave lens | (v) | The image is erect and of the same size as the object. |
| (vi) | The image is erect and smaller in size than the object. |
What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?
What do you mean by the term dispersion?
What is a spherical mirror?
The letters on the front of an ambulance are written laterally inverted like 
. Give reason.
State whether the image in part (a) is real or virtual?
The image formed by a convex mirror is
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
Define the term Principle focus.
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
Complete the following diagrams shown in the following figures by drawing the reflected rays.
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
Define the radius of curvature.
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
