Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
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?
In the figure shown here, what is the equivalent focal length of the combination of lenses? (Assume that all layers are thin)
In the given circuits (a), (b), and (c), the potential drop across the two p-n junctions is equal in:
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 $g= 10 \text{ m/s}^2$]: