Question 1 :
When a ray of light passes through a rectangular slab, made up of some transparent material other than glass, the emergent ray is
Question 2 :
If the focal length of a lens is $50\;cm$, its power would be
Question 3 :
A ray of light incident at the optical centre of lens, passes undeviated after refraction.<br>
Question 4 :
A unit vector along the incident ray of light is $\hat{i}$. The unit vector for the corresponding refracted ray of light is $\hat{r}\cdot \hat{n}$, a unit vector normal to the boundary of the medium and directed towards the incident medium. If $\mu$ is the refractive index of the medium, then Snell's law (second law) of refraction is :
Question 5 :
When light is refracted from a surface, which of its following physical parameters does not change?
Question 7 :
A focal length of a lens is 10 cm. What is power of a lens in dioptre?
Question 9 :
A convex lens makes a real image $4\ cm$ long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is $16\ cm$ tall. The length of the object must be
Question 10 :
The focal length of a convex mirror is $20\ cm$ its radius of curvature will be
Question 11 :
Fill in the blanks:Principal axis is also called ________ of the lens.
Question 13 :
A rod is placed in a beaker of full of water. It appears to be bent inside the water. Which of the following property of light is responsible for the rod appearing to be bent?
Question 14 :
The focal length of a lens can be expressed in :
Question 15 :
State the direction of incident ray which after reflection from a spherical mirror retraces its path:
Question 17 :
A virtual image larger than the object can be produced by a
Question 18 :
A ray of light strikes the glass slab at an angle of $50^o$. Then the angle of incidence will be _____.
Question 19 :
The power of a lens is negative. State whether it is convex or concave?<br/>
Question 20 :
A real image, equal in size to the object, is obtained when the object is placed at the centre of curvature in front of which mirror?
Question 23 :
A ray of light coming parallel to the principal axis after passing through a convex lens, has passed through its :
Question 24 :
A ray passing with which part of a lens emerges undeviated ?
Question 25 :
Which of the following term is not associated with a lens?
Question 26 :
When the face is very close to the spoon the image formed by the outside bulged part?
Question 27 :
What type of mirror can be used alone to obtain a real image of a real object?
Question 28 :
The magnification of an image by a convex lens is positive only when the project is placed:
Question 29 :
In order to get a diminished virtual image, the object can be placed anywhere in front of a :
Question 30 :
The value of the focal length of the lens is equal to the value of the image distance when the rays are
Question 31 :
The power of a lens whose focal length is one metre is ______ dioptre.
Question 32 :
The power of two convex lenses $A$ and $B$ are $8$ diopters and $4$ diopters respectively. If they are to be used as a simple microscope, the magnification of
Question 33 :
What is the formula for spherical mirrors for object distance p and image distance q ?<br/>
Question 35 :
What is the angle of incidence when a ray of light incident on a concave mirror from its centre of curvature?
Question 36 :
The maximum magnification that can be obtained with a convex lens of focal length $2.5\ cm$ is ( the least distance of distinct vision is $25\ cm$)
Question 37 :
Which of the following is not a characteristic of image formed by Concave lens ?
Question 38 :
What is the power of a concave lens of focal length50 cm?
Question 39 :
Which of the following is not a characteristic of the image formed by Convex lens ?
Question 40 :
Which of the following is not a use of concave lens?
Question 42 :
State whether the following statement is True or False. <br/>The image formed by a convex lens is real diminished and erect.
Question 43 :
State whether the following statement is True or False.A concave mirror always forms a real image
Question 44 :
The power of a lens is $+2.0D$. Find its focal length and state the kind of the lens.<br>
Question 45 :
The relation among $u$, $v$ and $f$ for a mirror is:
Question 46 :
The mirror which always produces an erect and virtual image of a real object is:<br/>
Question 47 :
How does the power of a lens change if its focal length is doubled?<br>
Question 48 :
On the basis of their experiment, "To trace the path of a ray of light through a rectangular glass slab," students of a class arrived at which one of the following conclusions :
Question 49 :
Concave lens is used in cameras to focus an image of film. Is the statement True or False?<br/>
Question 50 :
A ray of light incident at a point on the principal axis of a convex lens passes undeviated through the lens. What special name is given to this point on the principal axis?<br>
Question 51 :
The resolving power of an astronomical telescope is $0.2$ seconds. If the central half portion of the objective lens is covered, the resolving power will be:-
Question 52 :
Let the $\mathrm{x}-\mathrm{y}$ plane be the boundary between two transparent media. Medium 1 in $\mathrm{z}\geq 0$ has a refractive index of $\sqrt{2}$ and medium 2 with $\mathrm{z}< 0$ has a refractive index of $\sqrt{3}$. A ray of light in medium 1 given by the vector $\vec{\mathrm{A}}=6\sqrt{3}\hat{\mathrm{i}}+8\sqrt{3}\hat{\mathrm{j}} + 10\hat{\mathrm{k}}$ is incident on the plane of separation. The angle of refraction in medium 2 is<br>
Question 53 :
Power of a lens is -40 , its focal length is
Question 54 :
In an optical instrument a convex lens of focal length 20 cm is used and kept in contact with a concave lens of focal length 40 cm, What is the power of this combination?
Question 55 :
A man is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm. The diameter of the sun is $ 1.39 \times 10^9 m$ and its mean distance from the earth is $1.5 \times 10^{11} \ m$, the diameter of the sun's image on the paper is 
Question 56 :
A ray of light passes from glass, having a refractive index of $1.6$ to air. The angle of incidence for which the angle of refraction is twice the angle of incidence is
Question 57 :
The image formed by objective lens of compound telescope will be:
Question 59 :
A concave mirror produces $10$ times enlarged image (real) of an object placed $1 cm$ in front of it. Where is the image located?
