Answer / gulshan kumar

Periscope:-It is a device for viewing objects which are above the eye level of the observer, or are placed in such a way that direct vision is obstructed. In its simplest form it consists of a long tube, but at right angles at two places. At each bend a right angled prism is so situated that by total internal reflection at the longest faces, light is turned through an angle 90oC by each prism. Thus light from a viewed object enters the observer’s eye in a direction parallel to but below the original direction of the object.

How we are getting light from electrical bulb?

0 Answers  

---

Why does a heavy stone nor break a glass place when place slowly on it, while a small stone falling from a great height easily breaks it ?

3 Answers  

---

What is the difference between photodiode & photocell.

1 Answers  

---

What is meant by refraction of a wave?

0 Answers  

---

Explain the Effect of Temperature on Vapour Pressure ?

1 Answers  

---

does plane mirror produce real image?how?

6 Answers  

---

Explain the Light ?

2 Answers  

---

when does one exert greater pressure on ground during walking or standing? why ? what happends to the period of a simple pendulum taken into a deep mine

3 Answers  

---

What is the velocity of sound in air ?

2 Answers  

---

I observed this question to be asked in many exams - We cannot move even a finger without disturbing all the stars?Explain it.

1 Answers   Google,

---

Explain the Principle of Calorimetry ?

1 Answers  

---

Explain what is the longest lasting synthetic periodic element?

0 Answers  

---