Question 2 :
Ratio of the size of the image to the size of the object is known as:
Question 3 :
A person uses spectacles of power $+2\ D$. He is suffering from
Question 4 :
A real, inverted and equal in size image is formed by
Question 6 :
What is the angle of incidence when a ray of light incident on a concave mirror from its centre of curvature?
Question 7 :
State whether true or false:The angle of incidence is always smaller than angle of refraction when a ray travels from air to glass, at an oblique angle
Question 8 :
A ray of light is incident normally on a plane glass slab. What will be the angle of refraction ?
Question 9 :
State whether true or false : The degree of convergence of divergence of light rays achieved by a lens is expressed in terms of its power.
Question 11 :
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 12 :
Ray optics fail when the size of the obstacle is :
Question 13 :
When the height of the image is less than the height of the object, then magnification will be
Question 14 :
When a ray of light passes through a rectangular slab, made up of some transparent material other than glass, the emergent ray is
Question 15 :
A converging lens has a focal length of $50 cm$. The power of the lens is
Question 16 :
"Value of refractive index remains same for light rays with different wavelength and for a particular material"
Question 17 :
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the imagebecomes inverted. What type of mirror he is using
Question 18 :
Fill in the blanks:Principal axis is also called ________ of the lens.
Question 19 :
A concave mirror of focal length $f$ (in air) is immersed in water $(\mu=4/3).$ The focal length of the mirror in water will be
Question 20 :
A ray passing with which part of a lens emerges undeviated ?
Question 27 :
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 31 :
A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incident is $45^0$ and that of refraction is $30^0$. The refractive index of the medium with respect to air is:
Question 33 :
The power of a lens being $+4$ dioptres suggests that it is a
Question 34 :
A light ray travels at some angle (not head on) from water in a rectangular aquarium, through the glass side, and out into air . The indices if refraction for water, glass, and air are 1.33, about 1.6, and 1.0, respectively.<br/>Rank the material;s according to the angles of refraction  made by the light ray with the normal in each, greatest first.
Question 37 :
In order to get a diminished virtual image, the object can be placed anywhere in front of a :
Question 39 :
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 40 :
The power of a convex lens of focal length $2$ metre will be:
Question 41 :
The ratio of the size of the image to the size of the object is known as
Question 42 :
Find the power (with sign) of a concave lens of focal length $20cm$.<br/>
Question 43 :
The mirror which always produces an erect and virtual image of a real object is:<br/>
Question 44 :
A concave lens forms the image of an object which is :<br><br>
Question 45 :
During refraction through a glass block, the angle of refraction _______.
Question 46 :
The image formed by the given convex mirror when it is inside focal distance is:
Question 47 :
The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is :
Question 49 :
When an object is at infinity from a concave mirror, the image formed is
