Physics
The bats can fly in the dark because

They generate ultrasonic sound waves
They can see the objects in darkness
They generate flashes of light
They have weak legs and are likely to be attacked by predators

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Physics
Energy in reflected light :

Increases with the increase in angle
Becomes maximum for angle of incidence equal to 45°
Does not depends on the angle of incidence
Decreases with the increase in angle of incidence

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