Question 1 :
How will the image formed by a convex lens be affected if the central portion of lens is wrapped in black paper?<br>
Question 2 :
How will the image formed by a convex lens be affected if thecentral portion of lens is wrapped in black paper ?
Question 3 :
An air bubble in water shines because of the phenomenon of:
Question 4 :
Two lenses of power - 15 D and +5D are incontact with each other. The focal length of thecombination is<br>
Question 5 :
Magnification is 0.5 when the object distance is 10 cm. Find the power of the concave lens :
Question 7 :
A point object is placed at the centre of a glass sphere of radius $6\ cm$ and refractive index $1.5.$ The distance of virtual image from the surface is:
Question 8 :
An astronaut in a spaceship the sky appears black due to:
Question 9 :
Assertion: The images formed by total internal reflections are much brighter than those formed by mirrors or lenses
Reason: There is no loss of intensity in total internal reflection.
Question 10 :
If $f$ is the focal length of a lens, then the power of the lens is equal to
Question 12 :
A ray of light is incident on a transparent glass slab refractive index $1.62$. The reflected and the refracted rays are mutually perpendicular. The angle of incident is
Question 13 :
The magnifying power of a simple microscope can be increased if we use an eyepiece of
Question 14 :
Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consist of
Question 15 :
A wave has velocity v in medium P and velocity 2v in medium Q. If the wave is incident in medium P at an angle of 30, then the angle of refraction will be
Question 16 :
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 18 :
A simple camera with a converging lens of 60 mm focal length is focused on very far objects. To focus the camera on a nearby object 1.5 m away, the distance between the film and lens will have to be<br>
Question 22 :
A sharp image of a distant object is obtained on a screen using a convex lens. In order<br/>to determine the focal length of a lens, a student needs to measure the distance between:<br/>
Question 23 :
The angle of minimum deviation measured with a prism is $30^o$ and the angle of prism $60^o$. The refractive index of prism material is -
Question 24 :
A ray of light is incident on the surface of transparent medium at an angle of $45^o$ and is refracted in the medium at an angle of $30^o$. What will be the velocity of light in the transparent medium ? <br/>
Question 25 :
When total internal reflection occurs from a prism,________of incident light is reflected back to denser medium. Fill on the blank. 
Question 26 :
Calculate the focal length of a convex mirror of radius of curvature 20 cm. <br/>
Question 28 :
An object is placed at a distance of $5$ cm from a convex lens of focal length $10$ cm, then the image
Question 29 :
Assertion: Critical angle of light passing from glass to air is minimum for violet color.
Reason: The wavelength of blue light is greatest to the light of other colors.
Question 31 :
A solid transparent sphere has a small opaque dot at its centre. When observed from outside, the apparent position of the dot will be
Question 32 :
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 37 :
Two thin lenses of focal length $f_1$ and $f_2$ are in contact and coaxial. The power of the combination is
Question 38 :
A thin lens produce an image of the same size as the object.Then first the optical center of the lens, distance of the object is
Question 40 :
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:
Question 42 :
Why is the focal point for any convex lens a little inexact with ordinary white light?
Question 44 :
A man with normal near point $(25 \,cm)$ reads a book with small point using a magnifying glass, a thin convex lens of focal length $5 \,cm$.
Question 47 :
When the height of the image is less than the height of the object, then magnification will be
Question 48 :
Rectilinear motion of light in a medium is caused due to:
Question 49 :
When light is refracted from a surface, which of its following physical parameters does not change?
Question 50 :
Rainbow is formed in which direction with respect to the sun?
Question 52 :
The expression for the magnification of a spherical mirror in the terms of focal length (f) and the distance of the object from mirror (u) is
Question 53 :
The curved face of a plano-convex lens is silvered. If $ \mu $ be the refractive index and r the radius of curvature of this curvature surface, then the system behaves like a concave mirror of radius  <br/>
Question 54 :
An object is placed at a distance of $f/2$ from a convex lens. The image will be
Question 55 :
A source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as
Question 56 :
A ray of light strikes a glass plate at an angle of $60^0$. If the reflected and refracted rays are perpendicular to each other the index of refraction of glass is
Question 57 :
An object is placed at a distance of $10 \ cm$ from a co-axial combination of two lenses $A$ and $B$ in contact. The combination forms a real image three times the size of the object. If lens $B$ is concave with a focal length of $30 \ cm$, what is the nature and focal length of lens $A$ ?
Question 58 :
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 59 :
The plano-convex lens of focal length $20\ cm$ and $30\ cm$ are placed together to form a double convex lens. The final focal length will be
Question 60 :
A ray of light strikes a glass plate at an angle of ${60}^{o}$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is
