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प्रश्न
Explain the following term related to spherical lenses:- principal axis
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उत्तर
Principal Axis:-
The principal axis of a lens is a line passing through the optical centre of the lens and perpendicular to both the faces of the lens.
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संबंधित प्रश्न
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. |
A virtual image larger than the object can be produced by a ______.
How is the focal length of a spherical mirror related to its radius of curvature?
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 following term in relation to concave mirror.
Pole
Define the following term in relation to concave mirror.
Principal axis
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
The radius of curvature of a spherical mirror is 18 cm. What is the focal length of this mirror?
