Is the formula "Real depth/Apparent depth `= mu."` valid if viewed from a position quite away from the normal ?

A ray travelling from glass to air, bends away from the normal. ____

The angle of elevation of top of a tower from a point on the ground is 30^@ and it is 60^@ when it is viewed from a point located 40 m away from the initial point towards the tower the height of the tower is

Prove that Refractive index= ("real depth")/("apparent depth")

A plane wave of sound travelling in air is incident upon a plane water surface. The angle of incidence is 60^@ . Assuming snell's law to be valid for sound waves, it follows that the sound wave will be refracted into water away from the normal.

A sphere made of transparent material of refractive index ( mu =3/2 )and of radius 50 cm has a small air bubble 10 cm below the surface. The apparent depth of the bubble if viewed from outside normally is

A small object is placed at the centre of the bottom of a cylindrical vessel of radius 3 cm and height 4 cm filled completely with water. Consider the ray leaving the vessel through a corner. Suppose this ray and the ray along the axis of the vessel are used to trace the image. Find the apparent depth of the image and the ratio of real depth to the apparent depth under the assumptions taken. Refractive index -of water = 1-33.

A mark on the surface of a glass spehre (mu=1.5) is viewed from a diametrically opposite position. It appears to be at a distance 10 cm from its actual position. The radius of the sphere is

When a ray of light travels obliquely from a rarer medium to a denser medium, it bends away from the normal.

The apparent depth of an object O from AB is

How does the pressure at a certain depth in water differ from that of the same depth in river water. Explain year answer.