Air bubble in water behaves as

An air bubble inside water behaves like a :

Assertion : A star will appear to twink le if seen from free space (say moon) Reason : An air bubbles inside water behave like a convergent lens .

An air bubble which is considered as biconvex air lens in water behaves as a

Assertion : The air bubble shines in water. Reason : Air bubble in water shines due to refraction of light.