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प्रश्न
Write scientific reason.
The bottom of a pond appears raised.
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उत्तर
- The rays of light coming from the bottom of a pond bend away from the normal as they travel from water (denser medium) to air (rarer medium).
- Hence, they appear to come from a point above the actual point from which they come. Therefore, the bottom of the pond appears raised.
संबंधित प्रश्न
What is refraction of light?
Name the phenomenon responsible for the following effect:
When we sit in front of a plane mirror and write with our right hand, it appears in the mirror that we are writing with the left hand.
If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?
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?
- What is the name of the phenomenon involved?
What is lateral inversion? Explain by giving a suitable example.
What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?
Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram:
- Incident ray
- Point of incidence
- Normal
- Reflected ray
- Angle of incidence
- Angle of reflection
State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?
The image of an object formed by a plane mirror is:
(a) virtual
(b) real
(c) diminished
(d) upside-down
A man sits in an optician's chair looking into plane mirror which is 2 m away from him and views the image of a chart which faces the mirror and is 50 cm behind his head. How far away from his eyes does the chart appear to be?
A ray of light goes from water into air. Will it bend towards the normal or away from the normal?
A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it?
State two factors on which the lateral displacement of the emergent ray depends.
When a ray of light travelling in glass enters into water obliquely ______.
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°
A vertical ray of light strikes the horizontal surface of some water:
- What is the angle of incidence?
- What is the angle of refraction?
Image is formed by a mirror due to refraction of light.
When a ray of light travels from air to glass, it bends .......... the normal.
A ray of light passes from medium 1 to medium 2. Which of the following quantities of the refracted ray will differ from that of the incident ray: Speed, intensity, frequency, wavelength?
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 ______.
Define the principal focus of a concave mirror.
Lights of different colours are used as signal for safety transport. From these, the wavelength of red light is _______ nm.
Write scientific reason.
The sun appears on the western horizon for some time after sunset.
Observe the given figure and name the following.
| Ray AB | |
| Ray NM | |
| Ray MD | |
| ∠ r |
The refractive index of four substances A, B, C, and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
The angle of incidence for a ray of light having zero reflection angle is ______.
Which surface will not reflect most of the light falling on them?
Light bends as it passes from one medium to another. What is this phenomenon called?
Mirage is an example of refraction and the total internal reflection of light.
Assertion: The air bubble shines in water.
Reason: Air bubble shines due to the refraction of light.
Why a pencil partly immersed in water appears to be bent at the water surface.
How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.
The ray that enters the second medium after crossing the boundary is called the:
When light travels from a rarer medium to a denser medium, its speed:
