मराठी

Light travelling from a denser medium to a rarer medium along a normal to the boundary: (a) is refracted towards the normal (b) is refracted away from the normal (c) goes along the boundary (d) is not refracted

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प्रश्न

Light travelling from a denser medium to a rarer medium along a normal to the boundary:

(a) is refracted towards the normal
(b) is refracted away from the normal
(c) goes along the boundary
(d) is not refracted

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उत्तर

 is not refracted

When a ray of light travels along the normal incident on the surface, it is not refracted.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 2: Refraction of Light - Exercise 1 [पृष्ठ २२१]

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लखमीर सिंह Physics [English] Class 10
पाठ 2 Refraction of Light
Exercise 1 | Q 32 | पृष्ठ २२१

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संबंधित प्रश्‍न

A wall reflects light and a mirror also reflects light. What difference is three in the way they reflect light? 


What is the difference between regular reflection of light and diffuse reflection of light? 


What type of reflection of light takes place from a cinema screen?


The boy walks towards the mirror at a speed of 1 m/s. At what speed does his image approach him?


Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram: 

(a) Incident ray
(b) Point of incidence
(c) Normal
(d) Reflected ray
(e) Angle of incidence
(f) Angle of reflection


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 ______.


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. 

If a ray of light passes from glass into water, which way will it bend : towards the normal or away from the normal?


 A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.


With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is. 


When a ray of light travelling in glass enters into water obliquely:

(a) it is refracted towards the normal
(b) it is not refracted at all
(c) it goes along the normal
(d) it is refracted away from the normal


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°


Image is formed by a mirror due to refraction of light.


We can see the sun even when it is little below the horizon because of ______.


Define the principal focus of a concave mirror.


List four characteristics of the image formed by a concave lens of focal length 20 cm when the object is placed at a distance of 40 cm from its optical centre. 


Noor, a young student, was trying to demonstrate some properties of light in her Science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter-paper screen to see the spots of light being cast as they emerged.

Her friend noted the following observations from this demonstration:

  1. Glass is optically rarer than air.
  2. Air and glass allow light to pass through them with the same velocity.
  3. Air is optically rarer than glass.
  4. Speed of light through a denser medium is faster than that of a rarer medium.
  5. The ratio: sin of angle of incidence in the first medium to the ratio of sin of angle of refraction in the second medium, gives the refractive index of the second material with respect to the first one.

Which one of the combinations of the above statements given below is correct.


A ray of light traveling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will ______.


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

A ray of light starting from diamond is incident on the interface separating diamond and water. Draw a labelled ray diagram to show. the refraction of light in this case.


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