Which phenomenon explains the splitting of white light into its constituent colors? Who formulated the laws of electricity and magnetism? Which spectral lines are visible in the hydrogen spectrum? Wha

1. The splitting of white light into its constituent colors is called dispersion. The correct option is (D).

$$\boxed{\text{D}}$$

2. The magnification ($m$) produced by a spherical mirror is given by the ratio of the image distance ($v$) to the object distance ($u$), with a negative sign.

$$m = -\frac{v}{u}$$

The correct option is (D).

$$\boxed{\text{D}}$$

3. The laws governing electricity and magnetism were unified and formulated by James Clerk Maxwell. The correct option is (D).

$$\boxed{\text{D}}$$

4. In the hydrogen spectrum, the only lines appearing in the visible region of the electromagnetic spectrum are the Balmer series lines. The correct option is (C).

$$\boxed{\text{C}}$$