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Why do stars twinkle? - Physics

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प्रश्न

Why do stars twinkle?

टीपा लिहा

उत्तर

  1. Light from the stars near the horizon reaches the earth obliquely through the atmosphere.
  2. It’s path changes due to refraction.
  3. Frequent atmosphere disturbances changes the path of light causes twinkling of stars.
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पाठ 6: Ray Optics - Evaluation [पृष्ठ ४९]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
पाठ 6 Ray Optics
Evaluation | Q 10. | पृष्ठ ४९

संबंधित प्रश्‍न

  1. Figure shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure?
  2. What is the answer if there is no outer covering of the pipe?

Light incident normally on a plane mirror attached to a galvanometer coil retraces backward as shown in Figure. A current in the coil produces a deflection of 3.5° of the mirror. What is the displacement of the reflected spot of light on a screen placed 1.5 m away?


Is the formula "Real depth/Apparent depth = μ" valid if viewed from a position quite away from the normal?


A narrow beam of white light goes through a slab having parallel faces.

(a) The light never splits in different colours

(b) The emergent beam is white

(c) The light inside the slab is split into different colours

(d) The light inside the slab is white


Consider the situation in figure. The bottom of the pot is a reflecting plane mirror, S is a small fish and T is a human eye. Refractive index of water is μ. (a) At what distance(s) from itself will the fish see the image(s) of the eye? (b) At what distance(s) from itself will the eye see the image(s) of the fish.


A converging beam of light traveling in air converges at a point P as shown in the figure. When a glass sphere of refractive index 1⋅5 is introduced in between the path of the beam, calculate the new position of, the image. Also, draw the ray diagram for the image formed.


What is critical angle and total internal reflection?


What is looming?


Light travels from an optically denser medium 'A' into the optically rarer medium 'B' with speeds 1.8 × 108 m/s and 2.7 × 108 m/s respectively. Then critical angle between them is ______.

1 and µ2 are the refractive indices of media A and B respectively.)


There are certain material developed in laboratories which have a negative refractive index (Figure). A ray incident from air (medium 1) into such a medium (medium 2) shall follow a path given by.


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