मराठी

The Boy Walks Towards the Mirror at a Speed of 1 M/S. at What Speed Does His Image Approach Him?

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प्रश्न

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

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उत्तर

The image approaches him at a speed of 2 m/s . The reason being, the image moves at a speed of 1 m/s and
 the relative speed of the image will be equal to the sum of the speeds of the image and the boy.   

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पाठ 1: Reflection of Light - Exercise 1 [पृष्ठ २२]

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लखमीर सिंह Physics Part 1 [English] Class 10
पाठ 1 Reflection of Light
Exercise 1 | Q 24. (b) | पृष्ठ २२

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संबंधित प्रश्‍न

State whether the following statement is true of false:
A student says that we can see an object because light from our eyes is reflected back by the object.


A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?


 Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper.


In which material do you think light rays travel faster-glass or air?


Light travels more quickly through water than through glass.

  1. Which is optically denser: water or glass?
  2. If a ray of light passes from glass into water, which way will it bend: towards the normal or away from the normal?

 Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.


  1. With the help of a diagram, show how when light falls obliquely on the side of a rectangular glass slab, the emergent ray is parallel to the incident ray.
  2. Show the lateral displacement of the ray on the diagram.

A vertical ray of light strikes the horizontal surface of some water:

  1. What is the angle of incidence?
  2. What is the angle of refraction?

Water is optically .......... than air.


Air is optically .......... than glass.


Lights of different colours are used as signal for safety transport. From these, the wavelength of red light is _______ nm.


Right or wrong sentence.

The incident rays and refracted rays are on opposite sides of the column.


Why does a ray of light bend when it travels from one medium to another?


You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at same angle would bend the most?


Twinkling of stars and Mirage are the two phenomena occurring due to refraction.


How do twinkling stars occur? (or) what is the cause of the twinkling of stars?


The ray that enters the second medium after crossing the boundary is called the:


When light passes from one transparent medium to another, its direction changes due to:


When a ray of light is incident along the normal on the surface separating two media:


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