Question 1 :
What is the power of the lens, if the far point of a short sighted eye is $200\ cm$?

Question 2 :
Which of the following are common to images formed by both Concave and Convex lens ?

Question 3 :
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 5 :
If the power of a lens is $0.1\;D$, its focal length is

Question 6 :
In case of a virtual and erect image, the magnification created by the mirror is

Question 7 :
Due to refraction, when seen from outside,a coin placed under water in a bowl, appears to

Question 8 :
If the light moving in a straight line bends by a small but fixed angle, it may be a case of<br>$(i)$reflection<br>$(ii)$refraction<br>$(iii)$diffraction<br>$(iv)$dispersion<br>

Question 10 :
A photograph of a horse is taken by a camera whose lens has&#160;been&#160;painted with&#160;black&#160;stripes. The&#160;photograph will be of a :

Question 11 :
A plane light&#160; wave travelling with velocity '$v$' in a medium A reaches a point on the interface of medium A and medium B. If velocity of sound in medium B is $2v$, the angle of incidence for total internal reflection of the wave will be greater than _____. $(\sin 30^o=0.5$ and $\sin 90^o=1)$

Question 12 :
The difference in the number of wavelengths,&#160;when yellow light propagates through air and&#160;vacuum columns of the same thickness is one.&#160;The thickness of the air column is :(Refractive index of air $\mu _{a}=$1.0003 ;&#160;Wavelength of yellow light in vacuum $= 6000A^{\circ}$)<br/>

Question 13 :
If a lens has power -2.5D, then it is a :

Question 14 :
Assertion: Farther the image greater is the magnification. Reason: Magnification is equal to the ratio of the distance of the object and that of the image.

Question 15 :
Two power of a converging lens is 4 D and that of a diverging lens is 2.5D.The power of this combination of lenses placed closed together is:

Question 17 :
Power of a lens is $+ 2.0 \mathrm { D }$then it's focal length is

Question 18 :
A convex lens of focal length 80 cm and concave lens of focal length 50 cm are combined together. What will be their resultant power?<br>

Question 19 :
A persons sees clearly at a distance of $ 100 cm $, then power of lens used to see object at $40 cm$ is

Question 20 :
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 21 :
A small object of linear dimension $x$ lies on the axis of an optical mirror of local length $f$ at a distance $a$ from mirror. The linear dimension of image:

Question 22 :
A ray of light going towards the centre of curvature of a convex mirror ............

Question 23 :
A flim projector magnifies a flim of area $100 $ square centimeter on screen. If linear magnification is $4$ then area of magnified image on screen will be-

Question 24 :
The angle between the incident ray and the normal is called ________.<br>

Question 25 :
In the table below, column I lists various mirrors &#160;and lenses and column II their uses, qualities or properties.<br/><table class="wysiwyg-table"><tbody><tr><td>column &#160;I</td><td>Column II</td></tr><tr><td>I. Plane mirror</td><td>A. Feels thinner in the middle.</td></tr><tr><td>II. Concave mirror</td><td>B. Always forms virtual image.</td></tr><tr><td>III. Convex mirror</td><td>C. Always forms virtual image of smaller size.</td></tr><tr><td>IV. Concave lens&#160;</td><td>D.&#160;Is used by dentists to examine teeth.</td></tr><tr><td>V. Convex lens</td><td>E. Can be used as reading glass.<br/></td></tr></tbody></table>The correct matching is:

Question 27 :
The magnitude of focal length of a concave mirror is $f$. An object is placed at a distance $x$ from the focus and forms a real image. The magnification is:<br/>

Question 28 :
An image of a bright square is obtained on a screen with the aid of a convergent lens. The distance between the square and the lens is $40\ cm$. The area of the image is nine times larger than that of the square. Select the correct statement(s).

Question 29 :
A water film is formed on a glass-block. A light ray is incident on water film from air at an angle of$\displaystyle { 60 }^{ \circ }$ with the normal. The angle of incidence on glass slab is<br>($\displaystyle { \mu }_{ g } = 1.5,{ \mu }_{ w } = \frac { 4 }{ 3 }$)

Question 30 :
The distance between an object and its doubly magnified image by a concave mirror is: [ Assume $f$ = focal length]