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qUESTIONS

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

MCQs-PYQs-12th-jee

Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 30° at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is

MCQs-PYQs-12th-jee

A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2 L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is

MCQs-PYQs-12th-jee

To get three images of a single object, one should have two plane mirrors at an angle of

MCQs-PYQs-12th-jee

A light bulb is placed between two plane mirrors inclined at an angle of 60°. The number of images formed are

MCQs-PYQs-12th-jee

In an experiment to find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like

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