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प्रश्न
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
Which type of spherical mirror will it provide?
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उत्तर
Since the outer surface is shiny, it will form a convex mirror.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Principal focus
We can obtain a real, enlarged and inverted image by a concave 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. |
Define the Focal length of a spherical mirror
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
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.
Name the kind of mirror used to obtain:
A virtual and enlarged image
What is meant by magnification? Write its expression. What is its sign for the (a) real (b) virtual, image?
Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror? Give one reason.
A straight stick partly dipped in water obliquely appears to be bent at the surface of the water.
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
An object 5 cm high forms a virtual image of 1.25 cm high, when placed in front of a convex mirror at a distance of 24 cm. Calculate:
- the position of the image
- the focal length of the convex mirror.
Define the term Aperture.
AB is the object, A'B' is the image, and MM' is the position of the mirror. Complete the ray diagram showing the formation of the image and find the focal length of the 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?
Which of the following has curved reflecting surface?
Spherical mirrors are one form of ______ mirrors.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
Define the radius of curvature.
