Find out no. of reflection after which right Ray will exit from (Given `sin 40^(@)=0.64`) (A) 130000 (B) 57803 (C) 140000 (D) 150000

The point on the axis which is equidistant from (-4,0) and (10,0) is , a) (7,0) (b) (5,0) c) (0,0) d) (3,0)

The point on the axis which is equidistant from (-4,0) and (10,0) is , a) (7,0) (b) (5,0) c) (0,0) d) (3,0)

The point on the axis which is equidistant from (-4,0) and (10,0) is , a) (7,0) (b) (5,0) c) (0,0) d) (3,0)

A ray of light is incident along a line which meets another line, 7x-y+1 = 0 , at the point (0, 1). The ray isthen reflected from this point along the line, y+ 2x=1 . Then the equation of the line of incidence of the ray of light is (A) 41x + 38 y - 38 =0 (B) 41 x - 38 y + 38 = 0 (C) 41x + 25 y - 25 = 0 (D) 41x - 25y + 25 =0

Find the coordinates of the point equidistant from the four points A(0,0,0) , B (a,0,0) , C(0,b,0) and D(0,0,c) .

Find the coordinates of a point equidistant from the origin and pints A(a ,0,0),\ B(0, b ,0)a n d\ C(0,0, c)dot

Find the reflection of the plane ax+by+cz+d=0 in the plane a\'x+b\'y+c\'z+d\'=0

In the given figure, if A B || D E , then the value of x is (a) 25^0 (b) 35^0 (c) 40^0 (d) 45^0

In figure, the optical fiber is I=2m long and has a diameter of d=20 mum . If a ray of light is incidnet on one end of the fiber at angle 0_(1)=40^(@)C , the number of reflections if makes before emerging from the other and is close to: (refractive index of fiber is 1.31 and sin40^(@)=0.64 )

If alpha,beta,gamma are the angle which a half ray makes with the positive direction of the axes then sin^2alpha+sin^2beta+sin^2gamma= (A) 1 (B) 2 (C) 0 (D) -1