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प्रश्न
The sun is seen before the sunrise and after the sunset.
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
A virtual image larger than the object can be produced by a ______.
What kind of mirror is required for obtaining a virtual image of the same size as the object?
A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do?
(A) Should move the mirror away from the screen.
(B) Should move the mirror towards the screen.
(C) Should move the mirror and screen both towards the sun.
(D) Should move only the screen towards the sun.
Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis.
The diagram below in Figure, shows a convex mirror. C is its centre of curvature and F is its focus. (i) Draw two rays from A and hence locate the position of image of object OA. Label the image IB. (ii) State three characteristics of the image.
A straight stick partly dipped in water obliquely, appears to be bent at the surface of water.
The spherical mirror used as a rear view mirror in the vehicle is
A student traces the path of a ray of light passing through a rectangular slab.
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For measuring the angle of incidence, he must position the protractor in the manner shown in the figure:
