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प्रश्न
List in proper sequence the steps of the experiment for determining the approximate focal length of a given concave mirror by obtaining the image of a distant object.
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उत्तर
(i) Fix the concave mirror on the stand and place it on table facing towards a distant object.
(ii) Arrange the screen on the table so that the image of the distant object is obtained on it.
(iii) Measure the distance between the mirror and the screen using a metre scale. This distance is the focal length (F) of the mirror.
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संबंधित प्रश्न
What is refraction of light?
| Column I | Column II | Column III | |
| 1 | Dispersion | Long-sightedness | Twinkling of stars |
| 2 | Refraction | Splitting of white light into component colours | Convex lens |
| 3 | Hypermetropia | Change in the direction of the ray of light due to change in medium | Spectrum of seven colours |
Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are ............ .
Which phenomenon of light makes the water to appear shallower than it really is?
The speed of light is more in glass than in water.
Air is optically .......... than glass.
Explain the working of a periscope.
Why a pencil partly immersed in water appears to be bent at the water surface.
Match the following:
| Column I | Column II | ||
| 1. | r > 90 | a. | Light gazes at the surface of separation between the two modes. |
| 2. | r = 90 | b. | No refraction. |
| 3. | r < 90 | c. | Refracted ray away from the normal |
When a ray of light is incident along the normal on the surface separating two media:
