If a parabolic reflector is `20` cm in diameter and `5` cm deep, find the focus.

If a parabolic reflector is 24 cm in diameter and 6 cm deep, find its focus.

If a parabolic reflector is 20 cm in diameter and 5 cm deep, then its focus is

A search light has a parabolic reflector (has a cross section that forms a 'bowl'). The parabolic bowl is 40 cm wide from rim to rim and 30cm deep. The bulb is located at the focus. (1) what is the equation of the parabola used for reflector? (2) How far from the vertex is the bulb to be placed so that the maximum distance covered?

Radius of a circle is 3.05 cm, then diameter =? Cm

A iron pillar consists of a cylindrical portion of 2.8 m height and 20 cm in diameter and a cone of 42 cm height sumounting it. Find the weight of the pillar if 1 cm^3 of iron weights 7.5 g.

From a solid cylinder whose height is 2.4 cm and the diameter 1.4 cm, a cone of the same height and same diameter is carved out. Find the volume of the remaining solid to the nearest cm^(3) .

The shape of solid iron rod is cylinderical Its height is 11 cm and base diameter is 7 cm Then find the total volume of 50 such rods.

The focus of a parabolic mirror is at a distance of 50 cm from its centre (vertex). If the mirror is 75 cm deep. Find diameter of the mirror.