Question 1 :
When a ray of light passes from an optically less dense medium to a more dense medium, it :

Question 2 :
If the refractive index of medium $b$ with respect to medium $a$ and that of medium $c$ with respect to medium b are given, then the refractive index of a medium $c$ with respect to a medium $a$ can be found by using the relation<br/>$n_{ca}\, =\, n_{ba}\, \times\, ........$<br/><br/>

Question 5 :
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 6 :
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 8 :
A camera is an optical instrument which makes use of a :

Question 9 :
Due to refraction, sunrise appears ______ sun comes to horizon&#160;and sunset appears______sun leaves horizon respectively.

Question 10 :
For an object at infinity, a concave mirror produces an image at its focus which is :

Question 12 :
The far point of a myopia eye is $1.5 m$. To correct this defect of the eye, the power of lens is _______.

Question 13 :
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 14 :
Light of frequency $\nu$, wave length $ \lambda $ travelling&#160;with a velocity $v$ enters into a glass slab of refractive index $ \mu $ then frequency, wave length and velocity of&#160;the wave in glass slab respectively are :<br/>

Question 15 :
The flat face of a plano-convex lens of focal length $10$cm is silvered. A point source placed $30$cm in front of the curved surface will produce a.

Question 16 :
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 18 :
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 19 :
The image obtained while finding the focal length of convex lens is...................

Question 20 :
A $2.5$ dioptre lens forms a virtual image which is $4$ times the object placed perpendicularly on the lens. Then the required distance of the object from the lens is .

Question 21 :
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-