I think it's b..................
I think you're talking about the 'greenhouse effect'.
Sadly, we're forced to answer the question without the benefit of the
list of choices, which, for some reason, you decided not to let us see.
Index of refraction of a substance =
(speed of light in vacuum) / (speed of light in the substance).
Any number greater than ' 1 ' can be an index of refraction. A number
less than ' 1 ' can't be . . . that would be saying that the speed of light
in this substance is greater than the speed of light in vacuum.
Answer:
True
Explanation:
A concave mirror produces real and inverted image when object placed at different locations beyond focus of the mirror.
A concave mirror produces virtual and erect and magnified image when an object placed between focus and the pole of the mirror.
