An air bubble in water will act like a :

When a light ray passes through from air to water with a non-zero angle the ray will be

A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of

When a mirror is rotated by an angle θ, the reflected ray will rotate by :

The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to

The human eye is like a camera that has a lens with :