## RAY OPTICS AND OPTICAL INSTRUMENTS-24 Quiz

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. Statement 1: A ray is incident from outside on a glass sphere surrounded by air as shown. This ray may suffer total internal reflection at the second interface
Statement 2: For a ray going from a denser to rarer medium, the ray may suffer total internal reflection
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(d) From symmetry, the ray shall not suffer TIR at second interface, because the angle of incidence at first interface equals to angle of emergence at second interface. Hence, Statement I is false

Q2.Statement 1: A beam of light rays has been reflected from a rough surface
Statement 2: Amplitude of incident and reflected rays would be different
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(b) Reflection of light rays takes place on rough as well as smooth surfaces. Some light energy would be absorbed by rough surface, so amplitude of reflected ray is less than that of incident ray

Q3.   Statement 1: It is impossible to photograph a virtual image
Statement 2: The rays which appear diverging from a virtual image fall on the camera and a real image is captured
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
A virtual image can certainly be photogarphed. Statement-1 is false. Statement-2 is true.

Q4. Statement 1: A light ray is incident on a glass slab. Some portion of it is reflected and some is refracted. Refracted and reflected rays are always perpendicular to each other
Statement 2: Angle of incidence is equal to angle of reflection
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution

Q5. Statement 1: In a movie, ordinarily 24 frames are projected per second from one end to the other of the complete film
Statement 2: The image formed on retina of eye is sustained upto 1/10 second after the removal of stimulus
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(c) After the removal of stimulus the image formed on retina is sustained up to 1/6 second

Q6. Statement 1: If a plane glass slab is placed on the letters of different colours all the letters appear to be raised up to the same height
Statement 2: Different colours have different wavelengths
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(c) Apparent shift for different coloured latter is
d=h(1-1/Î¼)⇒Î»_R>Î»_V so Î¼_R less than Î¼_V
Hence d_R less than d_V i.e. red coloured letter raised least

Q7. SStatement 1: The images formed by total internal reflections are much brighter than those formed by mirror or lenses
Statement 2: There is no loss of intensity in total internal reflection
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
In total internal reflection,
100% of incident light is reflected back into the same medium, and there is no loss of intensity,
while in reflection from mirrors and refraction from lenses, there is always some loss of intensity.
Therefore images formed by total internal reflection are much brighter than those formed by mirrors or lenses

Q8. Statement 1: Lights of different colours travel with different speeds in vacuum
Statement 2: Speed of light depends on medium
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(d) Speed of light (for all color) is same in vacuum, equal to 3×10^8 ms^(-1)
Speed of light is a property of medium

Q9. Statement 1: Convergent lens property of converging remain same in all mediums
Statement 2: Property of lens whether the ray is diverging or converging depends on the surrounding medium
•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution
(d) In air or water,
a convex lens made of glass behaves as a convergent lens but when it is placed in carbon disulfide, it behaves as a divergent lens.
Therefore, when a convergent lens is placed inside a transparent medium of refractive index greater than that of material of lens, it behave as a divergent lens.
It simply concludes that property of a lens whether the ray is diverging or converging depends on the surrounding medium

Q10. Statement 1: The illuminance of an image produced by a convex lens is greater in the middle and lens towards the edges
Statement 2: The middle part of image is formed by undeflected rays while outer part by inclined rays

•   Statement 1 is True, Statement 2 is True; Statement 2 is correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is True; Statement 2 is not correct explanation for Statement 1
•   Statement 1 is True, Statement 2 is False
•   Statement 1 is False, Statement 2 is True
Solution

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