Question 1 :
Two lenses of power -15 D and + 5D are in contact with each other. The focal length combination is:<br/>
Question 2 :
The relation between the linear magnification $m,$ the object distance $u$ and the focal length $f$ is
Question 4 :
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 6 :
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 7 :
An experiment is performed to find the refractiveindex of glass using a travelling microscope.In this experiment distances are measured by:<br>
Question 8 :
The power of a lens whose focal length is one metre is ______ dioptre.
Question 9 :
There is a small black dot at the centre $C$ of a solid glass sphere of refractive index $\mu$. When seen from outside, comment on the location of the dot.
Question 10 :
The incident ray, the normal at the point of incidence and the refracted ray:
Question 11 :
An object is situated at a distance of 15cm from a convex lens of focal length 30 cm. The position of the image formed by it will be <br/>
Question 12 :
A convex lens of focal length $30\ cm$ and a concave lens of $10\ cm$ focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave as a parallel beam, then the distance between two lenses will be
Question 13 :
A prism of refractive index $\sqrt2$ has refracting angle $60^0$. Angle of minimum deviation is:
Question 14 :
The focal length of objective and eye lens of a microscope are $4\ cm$and $8\ cm$respectively. If the least distance of distinct vision is $24\ cm$and object distance is $4.5\ cm$from the objective lens, then the magnifying power of the microscope will be
Question 15 :
A real object is placed at a distance $\dfrac{f}{2}$ in front of a concave mirror having focal length $f$. If object is shifted by a distance $\dfrac{f}{4}$ away from the mirror. Find the ratio of final magnification to initial magnification.
Question 16 :
A beam of light consisting of red, green, and blue colors is incident on a right-angled prism. The refractive indices of the material of the prism for the above red, green, and blue wavelengths are 1.39, 1.44, and 1.47, respectively. The prism will<br>
Question 17 :
A 2 cm diameter coin rests flat on the bottom of a bowl in which the water is which the water is 20 cm deep $\left( { \mu }_{ w }=4/3 \right) $. if the coin is viewed directly from above, what is the apparent diameter:
Question 18 :
A microscope is having objective of focal length $1\ cm$ and eyepiece of focal length $6\ cm$. If tube length is $30\ cm$ and image is formed at the least distance of distinct vision, what is the magnification produced by the microscope? Take $D = 25\ cm$.
Question 19 :
The radii of curvature of convexo - concave lens are 0.04 m and 0.05 m respectively. If its R.I. is 1.5. The focal length of the lens is
Question 20 :
A 5 D lens forms an image four times the size of an object. The objects distance is <br>
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 :
The convex side of a thin plano-convex lens with radius of curvature 60 cm is silvered to obtain a concave mirror. An object is located at a distance of 30 cm in front of this mirror. The distance of the image from the mirror is ($\mu$= 1.5)
Question 23 :
The diameter of the reflecting surface of spherical mirror is called ..............
Question 24 :
The angle between the incident ray and the normal is called ________.<br>
Question 25 :
A convex glass lens $\left( { \mu  }_{ g }=1.5 \right)$ has a focal length of 8 cm when placed in air. What is the focal length lens when it is immersed in water? $\left( { \mu  }_{ \omega  }=\dfrac { 4 }{ 3 }  \right) $
