Question

A lighted and an un-lighted building are focused using a concave mirror to get images of brightness Bl and Bu respectively. Then: a. Bl = Bu = 0 b. BL > Bu BL = B. d. Bl< Bu. ​

Answer 1

Answer:

ans d

Explanation:

as point source is brighter of dull image

Answer 2

The answer is Bl > Bu. Because:

• Bl is the lighted part on which the concave mirror is focused and concave mirrors usually focus on light and give us the image.
• Whereas, Bu being the unlighted part, if we focus we do not get an appropriate image due to less brightness.
• The light is focused inward using a concave mirror on a lighted building.
• Image is formed behind the mirror when focused on unlighted building as there is no refractiveness.