282277 A fish in an aquarium, \(30 \mathrm{~cm}\) deep in water can see a light bulb kept \(50 \mathrm{~cm}\) above the surface of water. The fish can also see the image of this bulb in the reflecting bottom surface of the aquarium. Total depth of water is \(60 \mathrm{~cm}\). Then the apparent distance between the two images seen by the fish is \(\left(\mu_{\mathrm{w}}=4 / 3\right.\) )

282278 An object is immersed in a fluid. In order that the object becomes invisible, it should

282279 The critical angle for the material of a prism is \(45^{\circ}\) and its refracting angle is \(30^{\circ}\). A monochromatic ray goes out perpendicular to the surface of emergence from the prism. Then the angle of incidence on the prism will be:

282280 A cylindrical vessel is filled with water \((\mu=4 / 3)\) as shown in figure. A coin placed in water at the bottom appears upto maximum distance of

282277 A fish in an aquarium, \(30 \mathrm{~cm}\) deep in water can see a light bulb kept \(50 \mathrm{~cm}\) above the surface of water. The fish can also see the image of this bulb in the reflecting bottom surface of the aquarium. Total depth of water is \(60 \mathrm{~cm}\). Then the apparent distance between the two images seen by the fish is \(\left(\mu_{\mathrm{w}}=4 / 3\right.\) )

282278 An object is immersed in a fluid. In order that the object becomes invisible, it should

282279 The critical angle for the material of a prism is \(45^{\circ}\) and its refracting angle is \(30^{\circ}\). A monochromatic ray goes out perpendicular to the surface of emergence from the prism. Then the angle of incidence on the prism will be:

282280 A cylindrical vessel is filled with water \((\mu=4 / 3)\) as shown in figure. A coin placed in water at the bottom appears upto maximum distance of

282277 A fish in an aquarium, \(30 \mathrm{~cm}\) deep in water can see a light bulb kept \(50 \mathrm{~cm}\) above the surface of water. The fish can also see the image of this bulb in the reflecting bottom surface of the aquarium. Total depth of water is \(60 \mathrm{~cm}\). Then the apparent distance between the two images seen by the fish is \(\left(\mu_{\mathrm{w}}=4 / 3\right.\) )

282278 An object is immersed in a fluid. In order that the object becomes invisible, it should

282279 The critical angle for the material of a prism is \(45^{\circ}\) and its refracting angle is \(30^{\circ}\). A monochromatic ray goes out perpendicular to the surface of emergence from the prism. Then the angle of incidence on the prism will be:

282280 A cylindrical vessel is filled with water \((\mu=4 / 3)\) as shown in figure. A coin placed in water at the bottom appears upto maximum distance of

282277 A fish in an aquarium, \(30 \mathrm{~cm}\) deep in water can see a light bulb kept \(50 \mathrm{~cm}\) above the surface of water. The fish can also see the image of this bulb in the reflecting bottom surface of the aquarium. Total depth of water is \(60 \mathrm{~cm}\). Then the apparent distance between the two images seen by the fish is \(\left(\mu_{\mathrm{w}}=4 / 3\right.\) )

282278 An object is immersed in a fluid. In order that the object becomes invisible, it should

282279 The critical angle for the material of a prism is \(45^{\circ}\) and its refracting angle is \(30^{\circ}\). A monochromatic ray goes out perpendicular to the surface of emergence from the prism. Then the angle of incidence on the prism will be:

282280 A cylindrical vessel is filled with water \((\mu=4 / 3)\) as shown in figure. A coin placed in water at the bottom appears upto maximum distance of