Physics Chapter 9 – Physical Optics (Class 11) for FSC, Entry Tests & NTS Preparation
Chapter 9, Physical Optics, is an important topic for Class 11 students preparing for FSC board exams, engineering entry tests like ECAT, NUST, FAST, and NTS exams. This chapter explains the nature of light, its propagation, and the phenomena that arise due to its wave properties. Understanding physical optics is essential for studying reflection, refraction, interference, diffraction, and polarization of light.
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A mixture of electric fields and magnetic fields is?
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
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Which photon carries the most energy?
PMC 2020
Physics
Optics, Nature of Light and Optical Instruments
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In interference energy destroyed
In Young’s Experiment, the central spot In Interference pattern is
Light rays coming from the tube light are
Interference is shown by Light
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
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The phenomenon by which light travels in an optical fibres is:
NUMS 2016
Physics
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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
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Which of the following can be the objective of Polarization:
The range of wavelengths for visible light is between _______.
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How can we define linear magnification produced by a lens?
NTS 2015 SMBBMC
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Sky appears blue due to?
mλ=2dsin(θ) this relation is called as
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The main difference between X rays and Y rays is:
PMC 2020
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If the grating element is made 1/10th the resolving power will become
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
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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
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A real image formed by convex lenses is always:
NUMS 2016
Physics
Optics, Nature of Light and Optical Instruments
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In an astronomical telescope, the distance between the objective and eyepiece is called:
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The central fringe in a diffraction pattern obtained by using a single slit 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
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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
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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
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Optics, Nature of Light and Optical Instruments
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Confining of wave into one plane is called
Incident rays of light parallel to the principal axis of a convex lens, after refraction by the lens, will:
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The phenomenon by which light travels in an optical fibres is:
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When light enters from air to glass remains constant?
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:
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Which of the following series lies in the ultraviolet range:
PMC 2020
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The branch of Physics in which we study the properties of light and its applications on optical instruments is called?
Wave fronts coming from small light bulb
.Light can be polarized by which of the following methods?
I. scattering of light
II. double refraction
III. reflection
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Formation of colours in a thin film of oil is due to:
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The distance between two fringes in double slit experiment is directly proportional to
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?
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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
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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
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If an Electromagnetic wave is plane polarized, then the direction of electric field and magnetic field will be
Length of the telescope is:
NTS 2015 SMBBMC
Physics
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Light can be polarized by:
reflection
double refraction
scattering of light
NTS 2017
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Key Concepts about Physical Optics
The chapter explains the wave nature of light and concepts such as wavelength, frequency, and speed. It covers interference of light, Young’s double-slit experiment, diffraction, and polarization. The chapter also discusses the applications of optical phenomena in real-life systems, including optical instruments, communication technologies, and scientific experiments. Each concept is explained with diagrams, examples, and step-by-step problem-solving methods. These concepts are highly important for FSC board exams, engineering entry tests like ECAT, NUST, FAST, and NTS exams.
Free Entry Test & NTS Preparation
Mastery of physical optics helps students understand light behavior, solve numerical problems, and apply concepts to optical systems and technologies. PLS Academy provides practice questions, solved past papers, and chapter-wise MCQs to help students revise these topics effectively. Regular study of this chapter improves problem-solving skills, conceptual clarity, and exam performance, ensuring students are well-prepared for FSC board exams, competitive entry tests, and NTS exams.
JazakAllah.
