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प्रश्न
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
पर्याय
plane
convex
concave
convex and concave
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उत्तर
concave
APPEARS IN
संबंधित प्रश्न
We can obtain an enlarged and erect image by a convex mirror.
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 type of image is formed:
on a cinema screen?
Write the mirror formula. Give the meaning of each symbol which occurs in it.
A 50 cm tall object is at a very large distance from a diverging lens. A virtual, erect and diminished image of the object is formed at a distance of 20 cm in front of the lens. How much is the focal length of the lens?
Draw separate diagram for the formation of virtual image of an object by a concave mirror.
Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.
Figure shows a concave mirror with its pole at P, focus F and centre of curvature C. Draw ray diagram to show the formation of image of an object OA.
Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror? Give one reason.
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
- Where will the image form?
- What will be the length of image?
Answer the following question:
Distinguish between the convex mirror and the concave mirror.
What is the relationship between the focal length and radius of curvature?
Define the term Focus of a concave mirror.
The spherical mirror used in a beauty parlour as make-up mirror is _______.
Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?
Define the following terms in the context of a diverging mirror:
- Principal focus
- Focal length
Draw a labelled ray diagram to illustrate your answer.
