(i) The diagram below shows a fish in the tank and its image seen in the surface of water.

(a) Name the phenomenon responsible for the formation of this image.
(b) A double convex lens with refractive index μ₁ inside two liquids of refractive indices μ₂ and μ₃ are shown in the diagrams below. The refractive indices are such that μ₂ > μ₁ and μ₁ > μ₃
How would a parallel incident beam of light refract when it comes out of the lens in each of the cases shown above?

(1) in Fig a.
(2) in figure b.

(ii) The refractive index of water is 1.33 at a certain temperature. When the temperature of water is increased by 40 °C, the refractive index changes to 'x'.
(a) State whether x < 1.33 or x > 1.33.
(b) State two differences between normal reflection and total internal reflection.

(iii) (a) Mixture of red+blue+green is passed through a convex lens as shown in the diagram below. State whether the ray passes through a single point or through different points on the principal axis after refraction.

(b) Name the invisible radiations which are studied using the quartz
(c) Stat one use of these radiations.
(d) Name one radiation having the wavelength longer than the wavelength of these radiations.

Solution

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