A lens when immersed in a transparent liquid becomes invisible. Under what condition does it happen?

Under what conditions is work said to be done?

What is corpus luteum? Under what conditions does it undergo degeneration?

Explain,why an air bubble inside a transparent liquid behaves like a diverging lens.

When unpolarized ligth passes from air to a transparent mediu,under what condition does the refleced ligth get polarize?

A convex lens of refrative index 1.5 is immersed in a liquid of refractive index: 1.5. what changes happen to the focal length of the lens in the three cases?

In a certain arrangement a proton does not get deflected while passing through a magnetic field region. Under what conditions in this possible?

A jar of height h is filled with a transparent liquid of refractive index mu as shown in Fig.6.05. At the centre of the jar on the bottom surface is a dot.Find the minimum diameter of a disc,such that when placed on the top surface symmetrically about the centre,the dot is invisible.

Under what condition is the relation S= ut correct?

A converging lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. If it is immersed in a liquid of refractive index 1.3, what will be the new focal length? How does the nature of the lens change. If this lens is immersed is a liquid of refractive index 1.8 ?