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Principal focus : A ray of light from the object, parallel to the principal axis, after refraction from a convex lens, passes through the principal focus on the other side of the lens. • In case of a concave lens, the ray appears to diverge from the principal focus located on the same side of the lens.
The sum of the total surface areas of two cubes is 1548 cm2. If the product of the length of their edges is 97 cm2, then find the ...
The circumference of a circle is 110 cm and the length of the rectangle is 4 times the radius of the circle. Find the area (in cm2) of the re...
A rectangular garden has a length of 15 meters and a width of 8 meters. A path 2 meters wide is constructed all around the garden. What is the area of t...
The breadth ‘b’ of a room is twice its height and half of its length. Find the length of the longest diagonal of the room
The quantity of sugar in a 28 percent sugar solution is 91 grams. What is the total quantity of the solution?
If a six digit number 3x 7z 8y is divisible by 7, 11, 13, then the average value of x, y, z is:
12 spheres of the same size are made by melting a solid cylinder of 12cm diameter and 12cm height. The Diameter of each sphere is.
In a right-angled triangle PQR, right-angled at Q, the length of the side PR is 17 units, length of the base QR is 8 units, and length of the side PQ i...
In a zoo, 30% of the people are males. 50% of the remaining are females and the remaining 630 are children. Find the total number of people in a zoo.
The perimeters of two similar triangles, ∆ PQR and ∆ XYZ are 48 cm and 24 cm respectively. If XY = 12 cm. then PQ is:
