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qUESTIONS

MCQs-PYQs-12th-jee

A light beam is travelling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are n0, n0/6, n0/8 respectively. The angle of incidence 0 for which the beam just misses entering Region IV is

MCQs-PYQs-12th-jee

A transparent solid cylindrical rod has a refractive index of 2/√3 It is surrounded by air. A light ray is incident at the mid- point of one end of the rod as shown in the figure,The incident angle for which the light ray grazes along the wall of the rod

MCQs-PYQs-12th-jee

A light ray travelling in glass medium is incident on glass-air interface at an angle of incidence 0. The reflected (R) and transmitted (7) intensities, both as function of 0, are plotted. The correct sketch is

MCQs-PYQs-12th-jee

White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

MCQs-PYQs-12th-jee

Consider telecommunication through optical fibres. Which of the following statements is not true

MCQs-PYQs-12th-jee

The phenomenon utilised in an optical fibre’is

MCQs-PYQs-12th-jee

A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

MCQs-PYQs-12th-jee

A ray of light passes through four transparent media with refractive indices μ₁, μ2, H3, and µ₁ as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

MCQs-PYQs-12th-jee

A container is filled with water (μ = 1.33) upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length (in cm) of the mirror is

MCQs-PYQs-12th-jee

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as [g = 10m/s²]

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