Question

If a(b-c) x^2 + b(c-a) x + c(a-b) = 0 has equal roots, show that 2/b = 1/a + 1/c​

Answer 1

Answer:

haaan water wala plane acha hai kyuki water sab drink krte hai aur alcohol tho koi koi xd

In experiment with a rectangular glass slab a student observed that a Ray of light incident at an angle of 60 degree with the normal on one face of the slab, after refraction strikes the opposite face of the slab before emerging out in air making an angle of 42 degree with the normal. Draw a labelled diagram to show the part of this ray. What value would you assign to the angle of refraction and angle of emergence.