A point source is suspended at a height h over the centre of a round. Table The lumious intensity. P of the source depends on the direction `theta` with the normal function P`theta` in terms of `theta`, assuming that` P(0)=P_(0)`

A point source is suspended at a hight h = 1.0 m over the centre of a round table of radius R = 1.0 m . The luminous intensity I of the source depends on direction so that illuminance at all points of the table is the same. Find the function I (theta) , where theta is the angle between the radiation direction and the vertical, as well as the luminous flux reaching the table if I (0) = I_(0) = 100 cd .

If sec 2 theta =p + tan 2 theta, then the value of sin^(2) theta in terms of p is

If sec theta+tan theta=p, obtain the values of sec theta,tan theta and sin theta in terms of p

An illuminant shaped as a plane horizontal disc S = 100 cm^(2) in area is suspended over the centre of a round table of radius R = 1.0 m . Its luminance does not depend on direction and is equal illuminant be suspended to provide maximum illuminance at the circumference of the table ? How great will that illuminance be? The liuminant is assumed to be a point source.

If tan p theta-tan q theta=0, then the values of theta form a series in

If the coordinates of a variable point P be (cos theta + sin theta, sin theta - cos theta) , where theta is a variable quantity, find the locus of P .

Find the values of theta and p, if the equation x cos theta+y sin theta=p is the normal form of the line sqrt(3)x+y+2=0

Determine the luminosity of a surface whose luminance depends on direction as L = L_(0) cos theta , where theta is the angle between the radiation direction and the normal to the surface.