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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:
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 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:
If the focal length of the objective lens is increased, then magnifying power of :
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:
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:
In the figure shown here, what is the equivalent focal length of the combination of lenses? (Assume that all layers are thin)
The following figure shows a logic gate circuit with two inputs $A$ and $B$ and the output $Y$. The voltage waveforms of $A$, $B$ and $Y$ are as given. The logic gate is:
A solid cylinder of mass $2 \text{ kg}$ and radius $50 \text{ cm}$ rolls up an inclined plane of angle of inclination $30^\circ$. The centre of mass of the cylinder has a speed of $4 \text{ m/s}$. The distance travelled by the cylinder on the inclined surface will be [take $g= 10 \text{ m/s}^2$]:
Two thin lenses are of the same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be:
A lens is made up of 3 different transparent media as shown in the figure. A point object O is placed on its axis beyond 2f. How many real images will be obtained on the other side?
The device that can act as a complete electronic circuit is:
The electron concentration in an n-type semiconductor is the same as the hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.
Sodium has body-centered packing. The distance between the two nearest atoms is $3.7\text{ \AA}$. The lattice parameter is:
The circuit is equivalent to: