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प्रश्न
Which property of light makes a pencil cast a shadow when it is held in front of a light source?
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उत्तर
One property of light that makes a pencil cast a shadow when it is held in front of it is that light travels in a straight line.
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संबंधित प्रश्न
Where is the image when you look at something in a mirror?
The letter F is placed in front of a plane mirror:
How would its image look like when seen in a plane mirror?
A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is ______.
Explain how to read the following message which was found on some blotting paper:
State two effects caused by the refraction of light.
Why does a ray of light bend when it travels from one medium to another?
Fill in the following blank with suitable word:
Light bends when is passes from water into air. We say that it is ............
Light travels more quickly through water than through glass.
Which is optically denser : water or glass?
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
(a) 0°
(b) 45°
(c) 90°
(d) 120°
Light travels at a lower speed in water than in air.
Water is optically .......... than air.
Match the Following
| Column A | Column B |
| (a) white Light | (1) Convex mirror |
| (b) Refraction | (2) Concave mirror |
| (c) Virtual images | (3) refraction |
| (d) Real images | (4) spectrum |
| (e) Prism | (5) ray of light from glass to air |
A ray of light A incident from air suffers partial reflection and refraction at the boundary of water.
- Complete the diagram showing (i) the reflected ray B and (ii) the refracted ray C.
- How are the angles of incidence i and refraction r related?
We can see the sun even when it is little below the horizon because of ______.
Write scientific reason.
A pencil appears to be broken near the surface of water.
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called ______.
The bottom of swimming pool appears to be less deep than the actual one because of
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