In the visible region of the spectrum the rotation of the place of polarization is given by `theta=a+(b)/(lambda^2)`. The optical rotation produced by a particular material is found to be `30^@` per mm at `lambda=5000Å` and `50^@` per mm at `lambda=4000Å`. The value of constant a will be

In figure, a screen is placed normaol to the line joining the two point coherent sources S_(1) and S_(2) . The interference pattern consists of concentric circles. If d = 0.5 mm, lambda = 5000 Å and D - 10 cm , find the value of n for the closest second bright ring.

In figure, a screen is placed normaol to the line joining the two point coherent sources S_(1) and S_(2) . The interference pattern consists of concentric circles. If d = 0.5 mm, lambda = 5000 Å and D - 10 cm , find the value of n for the closest second bright ring.

In the figure shown, a screen is placed normal to the line joining the two point coherent sources S_1 and S_2 . The interference pattern consists of concentric circles. (a)Find the radius of the nth bright ring. (b) If d=0.5 mm, lambda=5000 Å and D=100 cm, find the radius of the closest second bright ring. (c) Also, find the value of n for this ring.

In the figure shown, a screen is placed normal to the line joining the two point coherent sources S_1 and S_2 . The interference pattern consists of concentric circles. (a)Find the radius of the nth bright ring. (b) If d=0.5 mm, lambda=5000 Å and D=100 cm, find the radius of the closest second bright ring. (c) Also, find the value of n for this ring.

Balmer given an equation for wavelength of visible radiation of H-spectrum as lambda=(kn^(2))/(n^(2)-4) .The value of k in terms of Rydbrum constant R is