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An object is placed at a distance of 40 cm from a concave mirror of a focal length of 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be:
The barrier potential of a p-n junction depends on: (i) type of semiconductor material (ii) amount of doping (iii) temperature Which one of the following is correct?
Which logic gate is represented by the following combination of logic gates?
A biconvex lens has power $P$. It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be:
A plano-convex lens of unknown material and unknown focal length is given. With the help of a spherometer, we can measure the:
The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. The refractive index of the material of the lens is:
An astronomical telescope has an objective and eyepiece of focal lengths $40\text{ cm}$ and $4\text{ cm}$ respectively. To view an object $200\text{ cm}$ away from the objective, the lenses must be separated by a distance of:
The output of the logic circuit shown is equivalent to a/an:
The angle of incidence for a ray of light at a refracting surface of a prism is $45^\circ$. The angle of prism is $60^\circ$. If the ray suffers minimum deviation through the prism, the angle of deviation and refractive index of the material of the prism respectively are:
The given circuit is equivalent to:
A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
If the focal length of the objective lens is increased, then magnifying power of :
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\mu_1$ and $\mu_2$ and $R$ is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:
A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is:
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index:
Two transparent media A and B are separated by a plane boundary. The speeds of light in those media are $1.5 \times 10^8$ m/s and $2.0 \times 10^8$ m/s, respectively. The critical angle for a ray of light for these two media is:
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
A concave mirror of focal length $f_1$ is placed at a distance of $d$ from a convex lens of focal length $f_2$. A beam of light coming from infinity and falling on this convex lens concave mirror combination returns to infinity. The distance $d$ must be equal to:
During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
Which will make basic buffer?