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प्रश्न
The sun is seen before the sunrise and after the sunset.
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उत्तर
EARLY SUNRISE and SUNSET: At sun Rise: When the Sun is just below the horizon, the light from the Sun suffers refraction from RARE to DENSER medium (As the atmosphere is warmer than layers near the earth at that time) bends towards the normal at each refraction. Due to continuous bending of light rays, the Sun can be seen even when its actual position is just below the Horizon. As a result, the Sun is seen in advance, two minutes before it rises above the horizon in the morning.
Similarly, in the evening Sun is seen delayed by 2 minutes longer above the horizon after the Sunset.
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संबंधित प्रश्न
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
State the types of mirrors used for (i) headlights and (ii) rear view mirror, in cars and motorcycles. Give to justify your answer in each case.
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.
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
Define the following term in relation to concave mirror.
Center of curvature
Define the following term in relation to concave mirror.
Focal length
In the following figure shows a concave mirror with its pole (P), focus (F) and centre of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave 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.
