Question

don't spam..........​

Answer 1

Answer: plane mirror [a]

[b] Surface characteristics, which include surface roughness, surface hardness, and corrosion resistance of surface of machining products, have received attention in recent years.

[c] Since planets and moons do not emit light, the only reason we can see them is because they reflect light from some other source. The strongest source of light in our solar system is the sun, so usually we see planets and moons because they are reflecting sunlight.

[d] Sunday, 28 February , Theme for the National Science Day 2020 is "Women in Science". This year, the National Science Day will be celebrated at Vigyan Bhawan on February 28 with women in science as the focal theme of the programme.

Explanation:

Answer 2

(tex)hi(/tex)

I m back