An air bubble is formed inside water. Does it act as a converging lens or a diverging lens ?

An air bubble contained inside water. It behaves as

A biconcave lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

A biconcave lens made of a transparent material of refractive index 1.5 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason.

Given an optical axis MN and the positons of a real object AB and its image A 'B' , detormine diagramatically the positon of the lens (its optical centre O ) and its foci, it it a converging or diverging lens? Is the image real or virtual?

A point source of light is placed inside water and a thin converging lens of focal length f is placed just outside the surface of water. The image of source is formed at a distance of 50 cm from the surface of water. When the lens is placed just inside the water surface the image is formed at a distance of 40 cm from the surface of water. if focal length of the lens in air is f=(100k)/8 cm, then find the value of k. (given refractive index of lens is 3/2 and that of water is 4/3 and in both cases image is formed inside water for the viewer in air).

What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20 cm . Is the system a converging or a diverging lens ? Ignore thickness of the lenses.

Choose the following statement a True of False. a. The real image formed by a lens is always inverted. b. The image formed by a lens is always inverted. c. The image formed by a concave lens is always erect and diminished. d. An air bubble inside water acts like a concave lens. e. The distance between a real object and its real image formed by a single lens cannot be more than 4f. f. I an object is moved at a constant speed toward a convex lens from infinity to focus, then its image moves slower in the begninning and faster later on, away from the lens. g. The focal length of a glass (mu=1.5) lens is 10 cm in air. When it is completely immersed in water its focal length will become 40cm.

Air bubbles are formed in the rising column of water due to

An air bubble of radius 1mm is formed inside water at a depth 10m below free surface (where air pressure is 10^5 N/m^2 ). The pressure inside the bubble is – (Surface tension of water = 7 x× 10^(–2) N//m)

A compound microscope consists of an objects lens of focal length 2.0 cm and an eyepiece of focal length 20cm? If the system a converging or a diverging lens? Ignore thickness of the lenses.