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A student performed the experiment of determination of focal length of a concave mirror by u-v method using an optical bench of length 1.5 meter. The focal length of the mirror A student performed the experiment of determination of focal length of a concave mirror by u-v method using an optical bench of length 1.5 [...]

A smaller object is placed 50 cm to the left of a thin convex lens of focal length 30 cm. A convex spherical mirror of radius of curvature 100 cm is placed to the right of the lens A smaller object is placed 50 cm to the left of a thin convex lens of focal [...]

Two identical glass rods S1 and S2 (refractive index = 1.5) have one convex end of radius of curvature 10 cm. They are placed with the curved surfaces at a distance d as shown Two identical glass rods S1 and S2 (refractive index = 1.5) have one convex end of radius of curvature 10 cm. [...]

1.Get the algebraic expressions in the following cases using variables, constants and arithmetic operations: (vii) Product of numbers y and z subtracted from 10. (viii) Sum of numbers a and b subtracted from their product. 1.Get the algebraic expressions in the following cases using variables constants and arithmetic operations: (vii) Product of numbers y and [...]

The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and is one-third the size of the object. The wavelength of light inside the lens formed by a plano-convex lens at a distance of 8 m behind the lens is real and is one-third [...]

1.Get the algebraic expressions in the following cases using variables, constants and arithmetic operations: (iv) One-fourth of the product of numbers p and q. (v) Numbers x and y both squared and added. (vi) Number 5 added to three times the product of m and n. 1.Get the algebraic expressions in the following cases using [...]

1.Get the algebraic expressions in the following cases using variables, constants and arithmetic operations: (i) Subtraction of z from y. (ii) One-half of the sum of numbers x and y. (iii) The number z multiplied by itself. 1.Get the algebraic expressions in the following cases using variables constants and arithmetic operations: (i) Subtraction of z [...]

11.Find the area of the equilateral ABCD. Here, AC = 22 cm, BM = 3 cm, DN = 3 cm and BM ⊥ AC, DN ⊥ AC. 11.Find the area of the equilateral ABCD. Here AC = 22 cm BM = 3 cm DN = 3 cm and BM ⊥ AC DN ⊥ AC. October [...]

10.In the following figures, find the area of the shaded portions: 10.In the following figures find the area of the shaded portions: October 9, 2020 Category: Chapter 11 - Perimeter and Area , Maths , NCERT Class 7 ,

10.In the following figures, find the area of the shaded portions: 10.In the following figures find the area of the shaded portions: October 9, 2020 Category: Chapter 11 - Perimeter and Area , Maths , NCERT Class 7 ,