A solar cell is made up of ______.

Q. A solar cooker is made up of a concave mirror. Which of the following explains the working of such a solar cooking?

Q. In solar cells, a silicon solar cell $(\mu =3.5)$ is coated with a thin film of silicon monoxide $SiO(\mu =1.45)$ to minimise reflective losses from the surface. Determine the minimum thickness of $SiO$ that produces the least reflection at a wavelength of $550nm$, near the centre of the visible spectrum.

Q. Cell wall of a plant cell is made up of ______ .