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(b) Identify terms which contain y^2 and give the coefficient of y^2. (i) 8–xy^2 (ii) 5y^2+7x (b) Identify terms which contain y^2 and give the coefficient of y^2. (i) 8–xy^2 (ii) 5y^2+7x October 9, 2020 Category: Chapter 12 - Algebraic Expressions , Maths , NCERT Class 7 ,

Water (with refractive index = 4/3) in a tank is 18 cm deep. Oil of refractive index 7/4 lies on water making a convex surface of radius of curvature R = 6 cm as shown . Consider Water (with refractive index = 4/3) in a tank is 18 cm deep. Oil of refractive index 7/4 [...]

4.(a) Identify terms which contain x and give the coefficient of x. (v) 1+x+xy (vi) 12xy^2 + 25 4.(a) Identify terms which contain x and give the coefficient of x. (v) 1+x+xy (vi) 12xy^2 + 25 October 9, 2020 Category: Chapter 12 - Algebraic Expressions , Maths , NCERT Class 7 ,

4.(a) Identify terms which contain x and give the coefficient of x. (iv) 5+z+zx (vii) 7x+xy^2 4.(a) Identify terms which contain x and give the coefficient of x. (iv) 5+z+zx (vii) 7x+xy^2 October 9, 2020 Category: Chapter 12 - Algebraic Expressions , Maths , NCERT Class 7 ,

The focal length of a thin biconvex lens is 20 cm. When an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes from m25 to m50. The focal length of a thin biconvex lens is 20 cm. When an object is moved [...]

4.(a) Identify terms which contain x and give the coefficient of x. (i) y^2x+y (ii) 13y^2–8yx (iii) x+y+2 4.(a) Identify terms which contain x and give the coefficient of x. (i) y^2x+y (ii) 13y^2–8yx (iii) x+y+2 October 9, 2020 Category: Chapter 12 - Algebraic Expressions , Maths , NCERT Class 7 ,

Four combination of two thin lenses are given in List 1. The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5. Match lens combinations Four combination of two thin lenses are given in List 1. The radius of curvature of all curved surfaces is r [...]

Two transparent media of refractive indices mu 1 and mu 3 have a solid lens shaped transparent material of refractive index mu 2 between them as shown in figure in Column 2. Two transparent media of refractive indices mu 1 and mu 3 have a solid lens shaped transparent material of refractive index mu 2 [...]

3.Identify the numerical coefficients of terms (other than constants) in the following expressions: (vii) 3.14r^2 (viii) 2(l+b) (ix) 0.1y + 0.01y^2 3.Identify the numerical coefficients of terms (other than constants) in the following expressions: (vii) 3.14r^2 (viii) 2(l+b) (ix) 0.1y + 0.01y^2 October 9, 2020 Category: Chapter 12 - Algebraic Expressions , Maths , NCERT [...]

A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 cm away in front of the curved surface of the lens, an image of double the size A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 [...]