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A double convex lens, lens made of a material of refractive index µ₁, is placed inside two liquids or refractive indices µ₂ and µ3, as shown. μ₂> μ₁> μ3. A wide, parallel beam of light is incident on the lens from the left. The lens will give rise to

A substance is behaving as convex lens in air and concave in water, then its refractive index is

A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

A film projector magnifies a 100 cm² film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is

A ray of light incident on a glass sphere (refractive index √3) suffers total internal reflection before emerging out exactly parallel to the incident ray. The angle of incidence was

Optical Fibres are related to…

Pick out the correct statements about optical fibres from the following

A glass slab of thickness 3 cm and refractive index 3/2 is placed on ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be

Each quarter of a vessel of depth H is filled with liquids of the refractive indices n1, n2, n3 and n4 from the bottom respectively. The apparent depth of the vessel when looked normally is

The angles of incidence and refraction of a monochromatic ray of light of wavelength at an air glass interface are i and r, respectively. A parallel beam of light with a small spread δλ in wavelength about a mean wavelength is refracted at the same air glass interface. The refracted index μ of glass depends on the wavelength as μ(λ) = a + b/λ² where a and b are constant. Then the angular spread in the angle of refraction of the beam is

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