Question
Write the name of optical instruments.

Answer

→A number of optical devices and instruments have been designed utilising reflecting and refracting properties of mirrors, lenses and prisms. Periscope, Kaleidoscope, binoculars, telescopes, microscopes are some examples of optical devices and instruments that are in common use.
→Human eye is one of the most important optical device the nature has endowed us with.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Is it true that the reaction of a gravitational force is always gravitational, of an electromagnetic force is always electromagnetic and so on?
A rectangular coil of 100 turns has length 5cm and width 4cm. It is placed with its plane parallel to a uniform magnetic field and a current of 2A is sent through the coil. Find the magnitude of the magnetic field B if the torque acting on the coil is 0.2N m-1.
A metallic sphere is placed in a uniform electric field. Which one of paths a, b, c and d shown in the figure will be followed by the field lines and why?
Two unequal resistances R1 and R2 are connected across two identical batteries of emf $\varepsilon$ and internal resistance r. Can the thermal energies developed in R1 and Rbe equal in a given time. If yes, what will be the condition?

The torque of the weight of any body about any vertical axis is zero. Is it always correct?
Magnetic flux passing through plane of any coil is changing with time according to the relation $\phi=$ $\left(5 t^3+4 t^2+2 t-5\right) Wb$. Find the induced current in the coil at $t=2$ seconds given that resistance of the coil is 5 ohms.
A wire is bent in the form of a regular hexagon and a total charge q is distributed uniformly on it. What is the electric field at the centre? You may answer this part without making any numerical calculations.
Can you ever have a situation in which a light ray goes undeviated through a prism?
Can a metallic sphere of radius 1 cm acquire a charge of 1 Coulomb?
What effect does the dielectric medium have on the capacitance of a capacitor?