Question Answers
Sahay Sir > Question Answers
A point source of light S is placed on the axis of a lens of focal length 20 cm as shown. A screen is placed normal to the axis of lens at a distance x from it. Treat all rays as paraxial.
09
Oct
A point source of light S is placed on the axis of a lens of focal length 20 cm as shown. A screen is placed normal to the axis of lens at a distance x from it. Treat all rays as paraxial. A point source of light S is placed on the axis of a [...]
A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 cm away from the curved surface of the lens, an image of double the size of the object
09
Oct
A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 cm away from the curved surface of the lens, an image of double the size of the object A plano-convex lens is made of a material of refractive index n. When a small object is placed [...]
Rewrite the following rational numbers in the simplest form: (ii) 25/45
09
Oct
Rewrite the following rational numbers in the simplest form: (ii) 25/45 Rewrite the following rational numbers in the simplest form: (ii) 25/45 October 9, 2020 Category: Chapter 9 - Rational Numbers , Maths , NCERT Class 7 ,
Two converging lenses have focal length f1 and f2 (f1 > f2). The optical axis of the two lenses coincide. This lens system is used to form an image of real object. It is observed that
09
Oct
Two converging lenses have focal length f1 and f2 (f1 > f2). The optical axis of the two lenses coincide. This lens system is used to form an image of real object. It is observed that Two converging lenses have focal length f1 and f2 (f1 > f2). The optical axis of the two lenses [...]
A convex lens forms inverted image of a real object on a fixed screen. The size of image is 12 cm When lens is displaced 20 cm along principal axis it again forms a real image of size
09
Oct
A convex lens forms inverted image of a real object on a fixed screen. The size of image is 12 cm When lens is displaced 20 cm along principal axis it again forms a real image of size A convex lens forms inverted image of a real object on a fixed screen. The size of [...]
2. Construct an isosceles triangle in which the lengths of each of its equal sides is 6.5 cm and the angle between them is 110°.
09
Oct
2. Construct an isosceles triangle in which the lengths of each of its equal sides is 6.5 cm and the angle between them is 110°. 2. Construct an isosceles triangle in which the lengths of each of its equal sides is 6.5 cm and the angle between them is 110°. October 9, 2020 Category: Chapter [...]
1 Construct ∆DEF such that DE = 5 cm, DF = 3 cm and m ∠EDF = 90°.
09
Oct
1 Construct ∆DEF such that DE = 5 cm, DF = 3 cm and m ∠EDF = 90°. 1 Construct ∆DEF such that DE = 5 cm DF = 3 cm and m ∠EDF = 90°. October 9, 2020 Category: Chapter 10 - Practical Geometry , Maths , NCERT Class 7 ,
A convex lens made of glass (mu g = 3/2) has focal length f in air. The image of an object placed in front of it is inverted, real and magnified. Now the whole arrangement is immersed
09
Oct
A convex lens made of glass (mu g = 3/2) has focal length f in air. The image of an object placed in front of it is inverted, real and magnified. Now the whole arrangement is immersed A convex lens made of glass (mu g = 3/2) has focal length f in air. The image [...]
4.Construct ΔABC such that AB = 2.5 cm, BC = 6 cm and AC = 6.5 cm. Measure ∠B.
09
Oct
4.Construct ΔABC such that AB = 2.5 cm, BC = 6 cm and AC = 6.5 cm. Measure ∠B. 4.Construct ΔABC such that AB = 2.5 cm BC = 6 cm and AC = 6.5 cm. Measure ∠B. October 9, 2020 Category: Chapter 10 - Practical Geometry , Maths , NCERT Class 7 ,
3.Draw ΔPQR with PQ = 4 cm, QR = 3.5 cm and PR = 4 cm. What type of triangle is this?
09
Oct
3.Draw ΔPQR with PQ = 4 cm, QR = 3.5 cm and PR = 4 cm. What type of triangle is this? 3.Draw ΔPQR with PQ = 4 cm QR = 3.5 cm and PR = 4 cm. What type of triangle is this? October 9, 2020 Category: Chapter 10 - Practical Geometry , Maths [...]