Yellow light is preferred to during fog because of penetrates deeply due to its longer wave length it is much smaller than fog particles (The scattering effect of fog is independent of wave length).

Yes, It is possible for two lens to produce zero power.
Explanation:
when the two lens (one is concave & another one is convex lens) are combined together, the focal length of the combination of the two lenses is F.
Then
\(\frac{1}{F}=\frac{1}{f_{1}}+\frac{1}{f_{2}} \)
\(\text { if } f_{1}=f_{2}=f \)
\(f_{1}=f(\text { convex }) \)
\(f_{2}=-f(\text { concave) } \)
\(P=\frac{1}{F}=\frac{1}{f}-\frac{1}{f}=0 . \ P \rightarrow \text { power } \)

(i) Resolution: Resolution is the quality of image which is decided by diffraction effect and Rayleigh criterion.
(ii) Resolving power: The ability of an optical instrument to separate or distinguish small or closely adjacent objects through the image formation is said to be resolving power of the instrument.

(i) Dish antennas are curved because it receives parallel signal rays coming from the same direction.
(ii) These rays are reflected by parabolic dish and gathered at maintained antenna part which increases directivity of antenna and gives sufficient amplitude signal.

(i) A simple microscope is a single magnifying (converging) lens of a small focal length.
(ii) To get an erect, magnified, and virtual image of the object, the object is placed between F and P on one side of the Jens and viewed from another side of the lens.
(iii) There are two magnifications for two kinds of focusing.
(iv) The image is formed at infinity.
(v) The angular magnification is defined as the ratio of angle e, subtended by the image with an aided eye to the angle 80 subtended by the object with the unaided eye.
(vi) This is the magnification for normal focusing.
(vii) The magnification for normal focusing is one less than that for near point focusing.