Question 1 :
The value of the focal length of the lens is equal to the value of the image distance when the rays are
Question 2 :
A plane glass plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more
Question 3 :
A short sighted person can see distinctly only those objects which lie between $10cm$ and $100cm$ from him, The power of the spectacle lens required to see a distance object is
Question 4 :
The ratio of the sine of angle  of incidence to the sine of angle of refraction is a constant for :
Question 5 :
The focal length of a convex mirror is $20\ cm$ its radius of curvature will be
Question 8 :
Due to refraction, sunrise appears ______ sun comes to horizon and sunset appears______sun leaves horizon respectively.
Question 9 :
Magnification is 0.5 when the object distance is 10 cm. Find the power of the concave lens :
Question 11 :
The relation between the linear magnification $m,$ the object distance $u$ and the focal length $f$ is
Question 12 :
What is the formula for spherical mirrors for object distance p and image distance q ?<br/>
Question 13 :
When light is refracted from a surface, which of its following physical parameters does not change?
Question 15 :
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 16 :
Assertion: If refractive index of one medium is equal to refractive index of second medium, then beam does not bend at all.
Reason: The bending of light does not depend on refractive indices of media.
Question 17 :
A person uses spectacles of power $+2\ D$. He is suffering from
Question 20 :
What is the power of a concave lens of focal length50 cm?
Question 21 :
"Value of refractive index remains same for light rays with different wavelength and for a particular material"
Question 22 :
The power of a lens being $+4$ dioptres suggests that it is a
Question 23 :
To construct a ray diagram, you need a minimum of  _______ ray(s) whose path(s) after refraction through the lens are known.
Question 24 :
When a ray of light passes through a rectangular slab, made up of some transparent material other than glass, the emergent ray is
Question 25 :
A ray of light travelling in air strikes the surface of glass at angle of $45^{\circ}$. The angle of refraction in the glass will be :
Question 26 :
A ray of light passing through the .......... of the lens, passes on undeviated.
Question 27 :
Find the focal length of a convex lens, if its power is +2.0 D.
Question 28 :
During refraction through a glass block, the angle of refraction _______.
Question 29 :
Which of the below is one of the laws of refraction?<br>
Question 30 :
In case of a real and inverted image, the magnification created by the mirror is<br/>
Question 31 :
Material $1$ has an index of refraction of $1.15$.<br/>Material $2$ has an index of refraction of $2.30$.<br/>If light passes from air into each of these materials at the same angle of incidence, how will the angle of refraction in material $1$ compare to the angle of refraction in material $2$?
Question 32 :
Assertion: Magnetic field lines are continuous and closed.
Reason: Magnification of a convex mirror is always positive, but that of a concave mirror may be both positive or negative.
Question 33 :
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is $4 D$, the power of cut lens will be ________.
Question 34 :
Concave lens is used in cameras to focus an image of film. Is the statement True or False?<br/>
Question 39 :
When a ray of light passes through a rectangular glass slab, the angle of emergence
Question 40 :
Height of the image of an object on an principal axis produced by a convex lens is double the focal length of lens is $20 cm$, then image distance from the lens is:
Question 41 :
Which of the following is not a characteristic of image formed by a Concave lens ?
Question 44 :
If a $3cm$ tall object placed perpendicular to principal axis of a convex lens of focal length $15cm$ produces a real invented image of height $15cm$, then its object distance $(u)$ is ................ and image distance $(v)$ is ................
Question 45 :
The focal length of a convex lens is $5\,cm$,where should the object be placed to get  a real image with same size as that of object:
Question 46 :
Light moves from air into water. The light makes an angle of $47^{\circ}$ with the normal in the air. What angle will it make with the normal in the water?<br>The index of refraction for air is $1.00$.<br>The index of refraction for water is $1.33$
Question 48 :
The distance between an object and its real image produced by a converging lens is $0.72\ m$. The magnification is $2$. What will be the magnification when the object is moved by $0.04\ m$ towards the lens?
Question 50 :
Which of the following term is not associated with a lens?
