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qUESTIONS

MCQs-PYQs-12th-jee

Angle of a prism is 30° and its refractive index is √2 and one of the surfaces is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path

MCQs-PYQs-12th-jee

A ray of light is incident at an angle of incidence i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is n the angle of incidence i, is nearly equal to

MCQs-PYQs-12th-jee

For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index

MCQs-PYQs-12th-jee

The angle of incidence for a ray of light at a refracting surface of a prism is 45°. The angle of prism is 60°. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively,are

MCQs-PYQs-12th-jee

An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is

MCQs-PYQs-12th-jee

Two identical glass (ng = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between that two lenses filled with water (n = 4/3). The focal length of the combination

MCQs-PYQs-12th-jee

An object is located 4m from the first of two thin converging lenses of focal lengths 2m and 1m respectively. The lenses are separated by 3m. The final image formed by the second lens is located from the source at a distance of

MCQs-PYQs-12th-jee

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is

MCQs-PYQs-12th-jee

A concave mirror of focal length ‘fi’ is placed at a distance of ‘d’ from a convex lens of focal length ‘f2’. A beam of light coming from infinity and falling on this convex lens – concave mirror combination returns to infinity. The distance ‘d’ must equal

MCQs-PYQs-12th-jee

In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)

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