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qUESTIONS

MCQs-PYQs-12th-jee

An equiconvex lens is cut into two halves along (i) XOX’ and (ii) YOY’ as shown in the figure. Let f, f’, f” be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively

MCQs-PYQs-12th-jee

Two thin lenses of focal lengths f₁ and f₂ are in contact and coaxial. The combination is equivalent to a single lens of power

MCQs-PYQs-12th-jee

A thin lens has focal length fi and its aperture has diameter d. It forms an image of intensity I. Now the central part of the d/2 aperture upto diameter is blocked by an opaque paper. The focal length and image intensity will change to

MCQs-PYQs-12th-jee

A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the Sun is 1.39 x 10^9 m and its means distance from the earth is 1.5 x 10^11 m. What is the diameter of the Sun’s image on the paper

MCQs-PYQs-12th-jee

At places A and B using vibrating magnetometre, a magnet vibrates in a horizontal plane and its respective periodic time are 2 sec and 3 sec and at these places the earth’s horizontal components are HA and HB respectively. Then the ratio between HA and HB will be

MCQs-PYQs-12th-jee

Two identical thin plano-convex glass lenses (refractive index = 1.5) each having radius of curvature of 20 cm are placed with their convex surfaces in contact at the center. The intervening space is filled with oil of refractive index 1.7. The focal length of the combination is

MCQs-PYQs-12th-jee

A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens

MCQs-PYQs-12th-jee

The mathematical equation for magnetic field lines of force is

MCQs-PYQs-12th-jee

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will

MCQs-PYQs-12th-jee

If a magnet of pole strength m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will be

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