No matter how far you stand from a mirror, your image appears erect. The mirror may be:
a) plane
b) concave
c) convex
d) both a) and c).

d

Explanation:

plan and convex mirrors make ur image to be erect but concave is based on the object distance but the image will erect focal length and pole, have a great day!!!

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

newton's first law of motion