Physical Quantity - scalar, vector and tensor

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NCERT SCIENCE 10 CH10 LIGHT - IN TEXT QUESTION ANSWER

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THE PHYSICS CAFE                                                        CHAPTER TEN LIGHT: REFLECTION AND REFRACTION Ncert in-text Question Answer Page 168 Ncert Textbook   Question 1: Define the principal focus of a concave mirror. Answer: Light rays coming parallel to the principal are converged at a point on its principal axis. Then this point is known as the principal focus of the concave mirror. Question 2: The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Answer: Given Data: Radius of curvature R = 20 cm We know that, R = f / 2               20 = f / 2 Hence, the focal length of the given spherical mirror is 10 cm. Question 3: Name the mirror that can give an erect and enlarged image of an object. Answer: Concave mirror ...
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NCERT SCIENCE 10 CH10 LIGHT - TOPIC 1.01 TO 1.04

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THE PHYSICS CAFE                                CHAPTER TEN LIGHT - REFLECTION AND REFRACTION   1.01      Introduction - Theory of Light                                                                                     0   Particle nature of light: Light is supposed to be made up of particles and these particles travel in straight line Wave theory of light: Light is supposed to be made up of particles and these particles travel like a wave. Dual nature of light: At last, lig...
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NCERT 10TH CHAPTER 10 LIGHT - WORD MEANINGS

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THE PHYSICS CAFE                                  CHAPTER TEN LIGHT - REFLECTION AND REFRACTION Light – an energy, which helps to see objects. Ray - single light propagation Reflection – process of sending back light Refraction – process of bending of light when light changes medium Medium – the arrangement (in which substances are equi-spaced or absent) in which light can travel   Propagation – travelling of anything is called propagation of that thing Transparent – through which we can see Opaque - through which we cannot see Optical - of light Rare – more gap between particles Denser – lesser gap in particles Normal – Perpendicular (anything at 90˚) Plane – 2 dimensional surfaces Medium separating surface – the surface where two different mediums meets Gradually – slowly Virtual – not real Real - actual Erect – head is upside Inverted – h...
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