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A parallel beam of light falls axially on a thin converging lens of focal length 20 cm. The emergent light falls or a screen placed 30 cm beyond the lens. An opaque plate with A parallel beam of light falls axially on a thin converging lens of focal length 20 cm. The emergent light falls [...]

The lateral magnification of the lens with an object located at two different positions u1 and u2 are m1 and m2, respectively. Then the focal length of the lens is respectively. Then the focal length of the lens is The lateral magnification of the lens with an object located at two different positions u1 and [...]

Give first the step you will use to separate the variable and then solve the equation: (c) p/7=4 Give first the step you will use to separate the variable and then solve the equation: (c) p/7=4 October 8, 2020 Category: Chapter 4 - Simple Equations , Maths , NCERT Class 7 ,

Give first the step you will use to separate the variable and then solve the equation: (b) b/2=6 Give first the step you will use to separate the variable and then solve the equation: (b) b/2=6 October 8, 2020 Category: Chapter 4 - Simple Equations , Maths , NCERT Class 7 ,

An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at its focus such that the image a convex mirror is placed at its focus such that the image An object is placed at [...]

A convex lens forms an image of an object placed 20 cm away from it at a distance fo 20 cm on the other side of the lens. If the object is moves 5 cm toward the lens, the image will be A convex lens forms an image of an object placed 20 cm away [...]

2m = 7 2m = 7 October 8, 2020 Category: Chapter 4 - Simple Equations , Maths , NCERT Class 7 ,

Give first the step you will use to separate the variable and then solve the equation: (a) 3l = 42 Give first the step you will use to separate the variable and then solve the equation: (a) 3l = 42 October 8, 2020 Category: Chapter 4 - Simple Equations , Maths , NCERT Class 7 [...]

Give first the step you will use to separate the variable and then solve the equation: (H) y + 4 = – 4​ Give first the step you will use to separate the variable and then solve the equation: (H) y + 4 = – 4​ October 8, 2020 Category: Chapter 4 - Simple Equations [...]

A convex lens A of focal length 20 cm and a concave lens G of focal length 5 cm are kept along the same axis with the distance d between them. If a parallel beam of light falling on A convex lens A of focal length 20 cm and a concave lens G of focal [...]