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A real image formed by convex lenses is always:
NUMS 2016
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
An object placed in front of a concave mirror at a distance of X cm from the pole gives a 3 times magnified real image. If it is moved a distance of X+5cm, the magnification of the image becomes 2. The focal length of the mirror is:
NUMS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Which of the following can be the objective of Polarization:
The range of wavelengths for visible light is between _______.
NTS 2016 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
A 4 cm high object is located 10 cm from the converging lens, whose focal length is 20 cm. The image so formed will be:
NTS 2013
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The central fringe in a diffraction pattern obtained by using a single slit is?
When a certain metal surface is illuminated with light of frequency v. the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency V/2, the stopping potential is VO-/4. The threshold frequency for photoelectric emission is:
NUMS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Confining of wave into one plane is called
In an astronomical telescope, the lens called eyepiece forms an image of a distant object that is:
NTS 2016 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
When a certain metal surface is illuminated with light of frequency v. the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency V/2, the stopping potential is VO-/4. The threshold frequency for photoelectric emission is:
NUMS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
mλ=2dsin(θ) this relation is called as
NTS 2015 DUHS and JSMU
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
In an experiment, an object was placed on the principal axis of a convex lens 25 centimetres away from the lens. A real image 4 times the size of the object was obtained. The focal length of the lens is:
NTS 2017
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
How can we define linear magnification produced by a lens?
NTS 2015 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The phenomenon by which light travels in an optical fibres is:
NUMS 2016
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Interference is shown by Light
A parallel beam of white light is incident normally on a diffraction grating. It is noted that the second-order and third-order spectra partially overlap. Which wavelength in the third-order spectrum appears at the same angle as the wavelength of 600 nm in the second-order spectrum?
NTS 2013
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The distance between two fringes in double slit experiment is directly proportional to
Light rays coming from the tube light are
When light enters from air to glass remains constant?
In interference energy destroyed
A microscope has an objective of 10 mm focal length and eyepiece of 25 mm focal length. What is the distance between the lenses if the object is in sharp focus when it is 10.5 mm from the objective?
NTS 2015 DUHS and JSMU
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The branch of Physics in which we study the properties of light and its applications on optical instruments is called?
Light can be polarized by:
reflection
double refraction
scattering of light
NTS 2017
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
A microscope has an objective of 10 mm focal length and an eye piece of 25 mm focal length. What is the distance between the lenses, if the object is in sharp focus when it is 10.5 mm from the objective?
NTS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
.Light can be polarized by which of the following methods?
I. scattering of light
II. double refraction
III. reflection
NTS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
A mixture of electric fields and magnetic fields is?
The linear magnification produced by a lens is defined as the ratio of the:
I. Size of the image to the size of object
II. Size of the lens to the size of object
III. Size of the lens to the size of the image
NTS 2013
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
What will be the position of the object, when a convex lens of focal length 20 cm, is used to form an erect image which is twice as large as the object?
NTS 2016 DUHS & JSMU
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Which of the following series lies in the ultraviolet range:
PMC 2020
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The phenomenon by which light travels in an optical fibres is:
NUMS 2016
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Wave fronts coming from small light bulb
Length of the telescope is:
NTS 2015 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
If the grating element is made 1/10th the resolving power will become
Sky appears blue due to?
Two glass prisms Pl and P2 are to be combined together to produce dispersion without deviation. The angle of the prisms P1 and P2 are selected as 40 and 30 respectively. If the refractive index of prism Pl is 1.54, then that of P2 will be:
NUMS 2014
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Formation of colours in a thin film of oil is due to:
NTS 2015 SMBBMC
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
In Young’s Experiment, the central spot In Interference pattern is
In an astronomical telescope, the distance between the objective and eyepiece is called:
NTS 2013
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
If an Electromagnetic wave is plane polarized, then the direction of electric field and magnetic field will be
Which photon carries the most energy?
PMC 2020
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
Incident rays of light parallel to the principal axis of a convex lens, after refraction by the lens, will:
NTS 2017
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool:
The main difference between X rays and Y rays is:
PMC 2020
Physics
Optics, Nature of Light and Optical Instruments
Elimination Tool: