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To determine resistance of a galvanometer by half deflection method and to find its figure of merit. Aim: To determine resistance of a galvanometer by half deflection method and to find its figure of merit. Apparatus: Moving coil galvanometer , two resistance boxes , two one way keys , connecting wires , sand paper and a battery. Theory: To find resistance of galvanometer (G) Galvanometer of resistance G when connected in series with a resistance R and a battery of emf E , the current is I=E/(R+G) if 𝚹 is the deflection. K 𝚹  =  E/(R+G)   Now such a resistance S is connected in parallel with G , that the deflection becomes half i e 𝚹/2, then     K( 𝚹/2) = E/(R + (GS/(G+S)) Using K 𝚹 in this we have E/(R+G)2 = E(G+S) / R (G + S ) + GS , on solving G = RS/ (R-S) Half deflection method Class 12th Physics Practical To find figure of merits (k) Figure of merit is current per unit deflection i e ,  k=I/ 𝚹 k= I/ 𝚹=E /(R+G) 𝚹 Procedure:  a)To

CBSE CLASS 10TH SCIENCE CHAPTER LIGHT REFLECTION AND REFRACTION,RAY DIAGRAM PRACTICE PAPER In this practice paper multiple question are framed for one ray diagram . This topic is very important for CBSE class 10th students to score good marks.This topic is very interesting and easy. Now lets us proceed to the questions: CONCAVE MIRROR :  Q 1 Draw a ray diagram for concave mirror when the object is kept at infinity. OR Draw a ray diagram  for concave mirror when point size image is formed at focus. OR  Draw a ray diagram for the property of concave mirror when it is used as collector of radiation in solar cooker. Q 2   Draw a ray diagram for concave mirror when the object is kept beyond c. OR Draw a ray diagram for concave mirror when image formed is between C and F. OR Draw a ray diagram for converging mirror when magnification is -0.5. Q 3   Draw a ray diagram for concave mirror when the object is kept at c. OR Draw a ray diagram for conc

FOR QUESTIONS CLICK HERE Q 1 ANS CONCAVE MIRROR RAY DIAGRAM WHEN OBJECT IS AT INFINITY Q 2 ANS CONCAVE MIRROR RAY DIAGRAM WHEN OBJECT IS BEYOND C Q 3 ANS CONCAVE MIRROR RAY DIAGRAM  WHEN OBJECT IS AT C Q 4 ANS   CONCAVE MIRROR RAY DIAGRAM WHEN OBJECT IS BETWEEN C AND F Q 5 ANS CONCAVE MIRROR RAY DIAGRAM WHEN OBJECT IS AT F Q 6 ANS  CONCAVE MIRROR RAY DIAGRAM WHEN OBJECT IS BETWEEN P AND F Convex Mirror: Q1 Ans When object is kept at infinity in front of convex mirror Q 2 Ans When object is kept in front of convex mirror

For questions click here Hints: 1. When rays of lights parallel to the principal axis coming from infinity after refraction actual meet at a point on the principal axis , this point is known as principal  focus. 2. i) Wider field of view as it is convex outward,so it cover larger area. ii) It always form virtual,erect and diminished image. 3.  REAL IMAGES  VIRTUAL IMAGES 1 These images are formed due to actual intersection of light after reflection or refraction.  1 These images are formed due to apparent intersection of light after reflection or refraction. 2 They can be obtain on the screen. 2 They cannot be obtain on the screen. 3 These are always inverted.  3 These are always erect. 4. Change in speed of light when it travels from one medium to another.Speed increases from denser to rarer and speed decreases from rarer to denser. 5.At right angle to surface (i e 90 0 ) and angle of incidence zero degree. 6.It is the ratio of sine of angle of incidence to the

CBSE CLASS 10TH SCIENCE CHAPTER LIGHT REFLECTION AND REFRACTION PRACTICE PAPER LIGHT REFLECTION AND REFRACTION Answer the following question s : Q 1 Define principal focus of convex mirror. Q 2 Why convex mirror is used as a rear view mirror? Q 3 Distinguish between real images and virtual images. Q 4 What is the cause of refraction of light? Q 5 At what angle the ray of light should strike the surface of glass , so that it does not suffer any refraction? Q 6 State Snell's law of refraction. Q 7 Will the lateral displacement increases / decreases if glass slab is made more thicker? Q 8 Does the value of speed of light changes with medium. Q 9 Define second principal focus of concave lens and convex lens. Q 10 Define Power of a lens.Give its S I unit. Q 11 Define 1 D (one Diopter). Q 12 If power of a lens is negative find the nature of the lens. Q 13 Define linear magnification . Does it have any unit? Q 14 Why a concave mirror has a real principal focus , wh