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qUESTIONS

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]

MCQs-PYQs-12th-jee

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3 h and its radius h. When the beaker is filled with a liquid up to a height 2 h, he can see the lower end of the rod. Then the refractive index of the liquid is

MCQs-PYQs-12th-jee

A ray of light is incident at the glass-water interface at an angle i, it emerges finally parallel to the surface of water, then the value of ng would be

MCQs-PYQs-12th-jee

Let the x-y plane be the boundary between two transparent media. Medium 1 in z≥0 has refractive index of √2 and medium 2 with z less than 0 has a refractive index of √3. A ray of light in medium 1 given by the vector A = 6√3i+8√3j+10k incident on the plane of separation. The angle of refraction in medium 2 is

MCQs-PYQs-12th-jee

A ray of light travelling in the direction 1/2(i + √3j) is incident on a plane mirror. After reflection, it travels along the direction 1/2 (i-√3). The angle of incidence is

MCQs-PYQs-12th-jee

A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is

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