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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:
What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?
The dimensions of emf in MKS are:
In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance $0.03 \text{ mho}$ and current gain 25. If the above transistor is replaced with another one with transconductance of $0.02 \text{ mho}$ and current gain of 20, the voltage gain will be:
In an n-type semiconductor, which of the following statement is true?
The symbolic representation of four gates is shown as: Pick out which ones are for AND, NAND, and NOT gates, respectively.
To get an output $Y = 1$ from the circuit shown below, the input must be:
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C are as shown below. The logic circuit gate is:
For transistor action, which of the following statements is correct?
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of